PHP: setcookie - Manual (original) (raw)

(PHP 4, PHP 5, PHP 7, PHP 8)

setcookie — Send a cookie

Description

Once the cookies have been set, they can be accessed on the next page load with the $_COOKIE array. Cookie values may also exist in $_REQUEST.

Parameters

» RFC 6265 provides the normative reference on how each setcookie() parameter is interpreted.

name

The name of the cookie.

value

The value of the cookie. This value is stored on the clients computer; do not store sensitive information. Assuming thename is 'cookiename', this value is retrieved through $_COOKIE['cookiename']

expires_or_options

The time the cookie expires. This is a Unix timestamp so is in number of seconds since the epoch. One way to set this is by adding the number of seconds before the cookie should expire to the result of calling time(). For instance, time()+60*60*24*30 will set the cookie to expire in 30 days. Another option is to use the mktime() function. If set to 0, or omitted, the cookie will expire at the end of the session (when the browser closes).

Note:

You may notice the expires_or_options parameter takes on a Unix timestamp, as opposed to the date format Wdy, DD-Mon-YYYY HH:MM:SS GMT, this is because PHP does this conversion internally.

path

The path on the server in which the cookie will be available on. If set to '/', the cookie will be available within the entire domain. If set to'/foo/', the cookie will only be available within the /foo/ directory and all sub-directories such as /foo/bar/ ofdomain. The default value is the current directory that the cookie is being set in.

domain

The (sub)domain that the cookie is available to. Setting this to a subdomain (such as 'www.example.com') will make the cookie available to that subdomain and all other sub-domains of it (i.e. w2.www.example.com). To make the cookie available to the whole domain (including all subdomains of it), simply set the value to the domain name ('example.com', in this case).

Older browsers still implementing the deprecated» RFC 2109 may require a leading. to match all subdomains.

secure

Indicates that the cookie should only be transmitted over a secure HTTPS connection from the client. When set to [true](reserved.constants.php#constant.true), the cookie will only be set if a secure connection exists. On the server-side, it's on the programmer to send this kind of cookie only on secure connection (e.g. with respect to$_SERVER["HTTPS"]).

httponly

When [true](reserved.constants.php#constant.true) the cookie will be made accessible only through the HTTP protocol. This means that the cookie won't be accessible by scripting languages, such as JavaScript. It has been suggested that this setting can effectively help to reduce identity theft through XSS attacks (although it is not supported by all browsers), but that claim is often disputed.[true](reserved.constants.php#constant.true) or [false](reserved.constants.php#constant.false)

options

An associative array which may have any of the keysexpires, path, domain,secure, httponly and samesite. If any other key is present an error of level [E_WARNING](errorfunc.constants.php#constant.e-warning) is generated. The values have the same meaning as described for the parameters with the same name. The value of the samesite element should be either None, Lax or Strict. If any of the allowed options are not given, their default values are the same as the default values of the explicit parameters. If thesamesite element is omitted, no SameSite cookie attribute is set.

Note:

To set a cookie that includes attributes that aren't among the keys listed, use header().

Return Values

If output exists prior to calling this function,setcookie() will fail and return [false](reserved.constants.php#constant.false). Ifsetcookie() successfully runs, it will return [true](reserved.constants.php#constant.true). This does not indicate whether the user accepted the cookie.

Changelog

Version	Description
8.2.0	The date format of the cookie is now 'D, d M Y H:i:s \G\M\T'; previously it was 'D, d-M-Y H:i:s T'.
7.3.0	An alternative signature supporting an options array has been added. This signature supports also setting of the SameSite cookie attribute.

Examples

The following examples demonstrate some ways to send cookies.

Example #1 setcookie() send example

`<?php

$value

= 'something from somewhere';setcookie("TestCookie", $value);
setcookie("TestCookie", $value, time()+3600); /* expire in 1 hour */
setcookie("TestCookie", $value, time()+3600, "/~rasmus/", "example.com", true);?>`

Note that the value portion of the cookie will automatically be urlencoded when you send the cookie, and when it is received, it is automatically decoded and assigned to a variable by the same name as the cookie name. If you don't want this, you can usesetrawcookie() instead. To see the contents of our test cookie in a script, simply use one of the following examples:

<?php // Print an individual cookie echo $_COOKIE["TestCookie"];// Another way to debug/test is to view all cookies print_r($_COOKIE); ?>

Example #2 setcookie() delete example

When deleting a cookie you should assure that the expiration date is in the past, to trigger the removal mechanism in your browser. Examples follow how to delete cookies sent in previous example:

<?php // set the expiration date to one hour ago setcookie("TestCookie", "", time() - 3600); setcookie("TestCookie", "", time() - 3600, "/~rasmus/", "example.com", 1); ?>

Example #3 setcookie() and arrays

You may also set array cookies by using array notation in the cookie name. This has the effect of setting as many cookies as you have array elements, but when the cookie is received by your script, the values are all placed in an array with the cookie's name:

<?php // set the cookies setcookie("cookie[three]", "cookiethree"); setcookie("cookie[two]", "cookietwo"); setcookie("cookie[one]", "cookieone");// after the page reloads, print them out if (isset($_COOKIE['cookie'])) { foreach ($_COOKIE['cookie'] as <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mo>=</mo><mo>></mo></mrow><annotation encoding="application/x-tex">name => </annotation></semantics></math>name=>value) { <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mo>=</mo><mi>h</mi><mi>t</mi><mi>m</mi><mi>l</mi><mi>s</mi><mi>p</mi><mi>e</mi><mi>c</mi><mi>i</mi><mi>a</mi><mi>l</mi><mi>c</mi><mi>h</mi><mi>a</mi><mi>r</mi><mi>s</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">name = htmlspecialchars(</annotation></semantics></math>name=htmlspecialchars(name); <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>v</mi><mi>a</mi><mi>l</mi><mi>u</mi><mi>e</mi><mo>=</mo><mi>h</mi><mi>t</mi><mi>m</mi><mi>l</mi><mi>s</mi><mi>p</mi><mi>e</mi><mi>c</mi><mi>i</mi><mi>a</mi><mi>l</mi><mi>c</mi><mi>h</mi><mi>a</mi><mi>r</mi><mi>s</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">value = htmlspecialchars(</annotation></semantics></math>value=htmlspecialchars(value); echo "$name : $value \n"; } } ?>

The above example will output:

three : cookiethree two : cookietwo one : cookieone

Note: Using separator characters such as [ and ] as part of the cookie name is not compliant to RFC 6265, section 4, but supposed to be supported by user agents according to RFC 6265, section 5.

Notes

Note:

You can use output buffering to send output prior to the call of this function, with the overhead of all of your output to the browser being buffered in the server until you send it. You can do this by calling ob_start() andob_end_flush() in your script, or setting theoutput_buffering configuration directive on in yourphp.ini or server configuration files.

Common Pitfalls:

Cookies will not become visible until the next loading of a page that the cookie should be visible for. To test if a cookie was successfully set, check for the cookie on a next loading page before the cookie expires. Expire time is set via the expires_or_options parameter. A nice way to debug the existence of cookies is by simply calling print_r($_COOKIE);.
Cookies must be deleted with the same parameters as they were set with. If the value argument is an empty string, and all other arguments match a previous call to setcookie(), then the cookie with the specified name will be deleted from the remote client. This is internally achieved by setting value to 'deleted' and expiration time in the past.
Because setting a cookie with a value of [false](reserved.constants.php#constant.false) will try to delete the cookie, you should not use boolean values. Instead, use 0 for [false](reserved.constants.php#constant.false) and 1 for [true](reserved.constants.php#constant.true).
Cookies names can be set as array names and will be available to your PHP scripts as arrays but separate cookies are stored on the user's system. Consider explode() to set one cookie with multiple names and values. It is not recommended to useserialize() for this purpose, because it can result in security holes.

Multiple calls to setcookie() are performed in the order called.

Found A Problem?

walterquez ¶

13 years ago

Instead of this:
<?php setcookie( "TestCookie", $value, time()+(60*60*24*30) ); ?>

You can this:
<?php setcookie( "TestCookie", $value, strtotime( '+30 days' ) ); ?>

Bachsau ¶

13 years ago

Want to remove a cookie?

Many people do it the complicated way:
setcookie('name', 'content', time()-3600);

But why do you make it so complicated and risk it not working, when the client's time is wrong? Why fiddle around with time();

Here's the easiest way to unset a cookie:
setcookie('name', 'content', 1);

Thats it.

Anonymous ¶

5 years ago

Just an example to clarify the use of the array options, especially since Mozilla is going to deprecate / penalise the use of SameSite = none,  which is used by default if not using array options. 

<?php
$arr_cookie_options = array (
                'expires' => time() + 60*60*24*30, 
                'path' => '/', 
                'domain' => '.example.com', // leading dot for compatibility or use subdomain
                'secure' => true,     // or false
                'httponly' => true,    // or false
                'samesite' => 'None' // None || Lax  || Strict
                );
setcookie('TestCookie', 'The Cookie Value', $arr_cookie_options);    
?>

nacho at casinelli dot com ¶

8 years ago

It's worth a mention: you should avoid dots on cookie names.

<?php
// this will actually set 'ace_fontSize' name:
setcookie( 'ace.fontSize', 18 );
?>

paul nospam AT nospam sitepoint dot com ¶

19 years ago

Note when setting "array cookies" that a separate cookie is set for each element of the array.

On high traffic sites, this can substantially increase the size of subsequent HTTP requests from clients (including requests for static content on the same domain).

More importantly though, the cookie specification says that browsers need only accept 20 cookies per domain.  This limit is increased to 50 by Firefox, and to 30 by Opera, but IE6 and IE7 enforce the limit of 20 cookie per domain.  Any cookies beyond this limit will either knock out an older cookie or be ignored/rejected by the browser.

Anonymous ¶

18 years ago

something that wasn't made clear to me here and totally confused me for a while was that domain names must contain at least two dots (.), hence 'localhost' is invalid and the browser will refuse to set the cookie! instead for localhost you should use false.

to make your code work on both localhost and a proper domain, you can do this:

<?php
 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>d</mi><mi>o</mi><mi>m</mi><mi>a</mi><mi>i</mi><mi>n</mi><mo>=</mo><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">domain = (</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">d</span><span class="mord mathnormal">o</span><span class="mord mathnormal">main</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mopen">(</span></span></span></span>_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false;
setcookie('cookiename', 'data', time()+60*60*24*365, '/', $domain, false);

?>

gabe at fijiwebdesign dot com ¶

18 years ago

If you want to delete all cookies on your domain, you may want to use the value of:

<?php $_SERVER['HTTP_COOKIE'] ?>

rather than:

<?php $_COOKIE ?>

to dertermine the cookie names. 
If cookie names are in Array notation, eg: user[username] 
Then PHP will automatically create a corresponding array in <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mrow></mrow><mi>C</mi></msub><mi>O</mi><mi>O</mi><mi>K</mi><mi>I</mi><mi>E</mi><mi mathvariant="normal">.</mi><mi>I</mi><mi>n</mi><mi>s</mi><mi>t</mi><mi>e</mi><mi>a</mi><mi>d</mi><mi>u</mi><mi>s</mi><mi>e</mi></mrow><annotation encoding="application/x-tex">_COOKIE. Instead use </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8444em;vertical-align:-0.15em;"></span><span class="mord"><span></span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.07153em;">C</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">OO</span><span class="mord mathnormal" style="margin-right:0.07153em;">K</span><span class="mord mathnormal" style="margin-right:0.07847em;">I</span><span class="mord mathnormal" style="margin-right:0.05764em;">E</span><span class="mord">.</span><span class="mord mathnormal" style="margin-right:0.07847em;">I</span><span class="mord mathnormal">n</span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal">d</span><span class="mord mathnormal">u</span><span class="mord mathnormal">se</span></span></span></span>_SERVER['HTTP_COOKIE'] as it mirrors the actual HTTP Request header. 

<?php

// unset cookies
if (isset($_SERVER['HTTP_COOKIE'])) {
    <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>o</mi><mi>o</mi><mi>k</mi><mi>i</mi><mi>e</mi><mi>s</mi><mo>=</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>l</mi><mi>o</mi><mi>d</mi><mi>e</mi><msup><mo stretchy="false">(</mo><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><msup><mo separator="true">;</mo><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">cookies = explode(&#x27;;&#x27;, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">coo</span><span class="mord mathnormal">ki</span><span class="mord mathnormal">es</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1.0019em;vertical-align:-0.25em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen"><span class="mopen">(</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mpunct"><span class="mpunct">;</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mpunct">,</span></span></span></span>_SERVER['HTTP_COOKIE']);
    foreach($cookies as $cookie) {
        <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>p</mi><mi>a</mi><mi>r</mi><mi>t</mi><mi>s</mi><mo>=</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>l</mi><mi>o</mi><mi>d</mi><mi>e</mi><msup><mo stretchy="false">(</mo><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><msup><mo>=</mo><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">parts = explode(&#x27;=&#x27;, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8095em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">t</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1.0019em;vertical-align:-0.25em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen"><span class="mopen">(</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mrel"><span class="mrel">=</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span></span><span class="base"><span class="strut" style="height:0.3em;vertical-align:-0.1944em;"></span><span class="mpunct">,</span></span></span></span>cookie);
        <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mo>=</mo><mi>t</mi><mi>r</mi><mi>i</mi><mi>m</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">name = trim(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.4306em;"></span><span class="mord mathnormal">nam</span><span class="mord mathnormal">e</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">im</span><span class="mopen">(</span></span></span></span>parts[0]);
        setcookie($name, '', time()-1000);
        setcookie($name, '', time()-1000, '/');
    }
}

?>

synnus at gmail dot com ¶

5 years ago

The " PHPSESSID " cookie will soon be rejected because its " sameSite " attribute is set to " none " or an invalid value, and without " secure " attribute. To learn more about the "sameSite" attribute, visit https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite.

<?php
 ini_set("session.cookie_secure", 1);
 session_start();

my PHP code .... 

?>

ellert at vankoperen dot nl ¶

11 years ago

Caveat: if you use URL RewriteRules to get stuff like this: domain.com/bla/stuf/etc into parameters, you might run into a hickup when setting cookies.
At least in my setup a change in one of the parameters resulted in the cookie not being 'there' anymore.
The fix is simple: specify the domain. '/' will usualy do fine.

ilya at ilya dot top ¶

1 year ago

In any web browser there is a very commonly used option "Open previous windows and tabs" which is disabled by default, but many people enable it.
When this option is active, the web browser, when closing and reopening, instead of executing the termination and starting a new session, saves and restores the current session along with session cookies and sessionStorage.
Both session cookies and sessionStorage, contrary to expectations, can live for a very long time until the user closes the tab before closing the web browser.
If you want a cookie, for example with a time offset, to be guaranteed to have a short lifetime, you should explicitly specify this short lifetime, rather than relying on self-deletion on the session cookie.

Anonymous ¶

15 years ago

A period in a cookie name (like user.name) seems to show up in the <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mrow></mrow><mi>C</mi></msub><mi>O</mi><mi>O</mi><mi>K</mi><mi>I</mi><mi>E</mi><mi>a</mi><mi>r</mi><mi>r</mi><mi>a</mi><mi>y</mi><mi>a</mi><mi>s</mi><mi>a</mi><mi>n</mi><mi>u</mi><mi>n</mi><mi>d</mi><mi>e</mi><mi>r</mi><mi>s</mi><mi>c</mi><mi>o</mi><mi>r</mi><mi>e</mi><mo stretchy="false">(</mo><mi>s</mi><mi>o</mi><mi>u</mi><mi>s</mi><mi>e</mi><msub><mi>r</mi><mi>n</mi></msub><mi>a</mi><mi>m</mi><mi>e</mi><mo stretchy="false">)</mo><mi mathvariant="normal">.</mi><mi>T</mi><mi>h</mi><mi>i</mi><mi>s</mi><mi>m</mi><mi>e</mi><mi>a</mi><mi>n</mi><mi>s</mi><mi>t</mi><mi>h</mi><mi>a</mi><mi>t</mi><mi>f</mi><mi>o</mi><mi>r</mi><mi>e</mi><mi>x</mi><mi>a</mi><mi>m</mi><mi>p</mi><mi>l</mi><mi>e</mi></mrow><annotation encoding="application/x-tex">_COOKIE array as an underscore (so user_name). This means that for example </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord"><span></span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.07153em;">C</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">OO</span><span class="mord mathnormal" style="margin-right:0.07153em;">K</span><span class="mord mathnormal" style="margin-right:0.07847em;">I</span><span class="mord mathnormal" style="margin-right:0.05764em;">E</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">rr</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="mord mathnormal">a</span><span class="mord mathnormal">s</span><span class="mord mathnormal">an</span><span class="mord mathnormal">u</span><span class="mord mathnormal">n</span><span class="mord mathnormal">d</span><span class="mord mathnormal">erscore</span><span class="mopen">(</span><span class="mord mathnormal">so</span><span class="mord mathnormal">u</span><span class="mord mathnormal">se</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">n</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">am</span><span class="mord mathnormal">e</span><span class="mclose">)</span><span class="mord">.</span><span class="mord mathnormal" style="margin-right:0.13889em;">T</span><span class="mord mathnormal">hi</span><span class="mord mathnormal">s</span><span class="mord mathnormal">m</span><span class="mord mathnormal">e</span><span class="mord mathnormal">an</span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal">ha</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">ore</span><span class="mord mathnormal">x</span><span class="mord mathnormal">am</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">e</span></span></span></span>_COOKIE["user_name"] must be used to read a cookie that has been set with setcookie("user.name" ...), which is already rather confusing. 

Furthermore the variable <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mrow></mrow><mi>C</mi></msub><mi>O</mi><mi>O</mi><mi>K</mi><mi>I</mi><mi>E</mi><mo stretchy="false">[</mo><mi mathvariant="normal">&quot;</mi><mi>u</mi><mi>s</mi><mi>e</mi><msub><mi>r</mi><mi>n</mi></msub><mi>a</mi><mi>m</mi><mi>e</mi><mi mathvariant="normal">&quot;</mi><mo stretchy="false">]</mo><mi>w</mi><mi>i</mi><mi>l</mi><mi>l</mi><mi>r</mi><mi>e</mi><mi>t</mi><mi>a</mi><mi>i</mi><mi>n</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>v</mi><mi>a</mi><mi>l</mi><mi>u</mi><mi>e</mi><mi>s</mi><mi>e</mi><mi>t</mi><mi>b</mi><mi>y</mi><mi>s</mi><mi>e</mi><mi>t</mi><mi>c</mi><mi>o</mi><mi>o</mi><mi>k</mi><mi>i</mi><mi>e</mi><mo stretchy="false">(</mo><mi mathvariant="normal">&quot;</mi><mi>u</mi><mi>s</mi><mi>e</mi><mi>r</mi><mi mathvariant="normal">.</mi><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mi mathvariant="normal">&quot;</mi><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mo stretchy="false">)</mo><mi>a</mi><mi>n</mi><mi>d</mi><mi>n</mi><mi>o</mi><mi>a</mi><mi>m</mi><mi>o</mi><mi>u</mi><mi>n</mi><mi>t</mi><mi>o</mi><mi>f</mi><mi>c</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>i</mi><mi>n</mi><mi>g</mi><mi>s</mi><mi>e</mi><mi>t</mi><mi>c</mi><mi>o</mi><mi>o</mi><mi>k</mi><mi>i</mi><mi>e</mi><mo stretchy="false">(</mo><mi mathvariant="normal">&quot;</mi><mi>u</mi><mi>s</mi><mi>e</mi><msub><mi>r</mi><mi>n</mi></msub><mi>a</mi><mi>m</mi><mi>e</mi><mi mathvariant="normal">&quot;</mi><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mi mathvariant="normal">.</mi><mo stretchy="false">)</mo><mi>w</mi><mi>i</mi><mi>l</mi><mi>l</mi><mi>a</mi><mi>l</mi><mi>t</mi><mi>e</mi><mi>r</mi><mi>t</mi><mi>h</mi><mi>i</mi><mi>s</mi><mi>v</mi><mi>a</mi><mi>l</mi><mi>u</mi><mi>e</mi><mi mathvariant="normal">.</mi><mi>T</mi><mi>h</mi><mi>i</mi><mi>s</mi><mi>i</mi><mi>s</mi><mi>r</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>r</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>v</mi><mi>i</mi><mi>a</mi><mi>l</mi><mi>l</mi><mi>y</mi><mi>f</mi><mi>i</mi><mi>x</mi><mi>e</mi><mi>d</mi><mi>b</mi><mi>y</mi><mi>c</mi><mi>l</mi><mi>e</mi><mi>a</mi><mi>r</mi><mi>i</mi><mi>n</mi><mi>g</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi mathvariant="normal">&quot;</mi><mi>u</mi><mi>s</mi><mi>e</mi><mi>r</mi><mi mathvariant="normal">.</mi><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mi mathvariant="normal">&quot;</mi><mi>c</mi><mi>o</mi><mi>o</mi><mi>k</mi><mi>i</mi><mi>e</mi><mo separator="true">,</mo><mi>b</mi><mi>u</mi><mi>t</mi><mi>i</mi><mi>t</mi><mi>c</mi><mi>a</mi><mi>n</mi><mi>t</mi><mi>a</mi><mi>k</mi><mi>e</mi><mi>a</mi><mi>w</mi><mi>h</mi><mi>i</mi><mi>l</mi><mi>e</mi><mi>t</mi><mi>o</mi><mi>r</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>i</mi><mi>z</mi><mi>e</mi><mi>t</mi><mi>h</mi><mi>i</mi><mi>s</mi><mi>s</mi><mi>i</mi><mi>n</mi><mi>c</mi><mi>e</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>r</mi><msup><mi>e</mi><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mi>s</mi><mi>o</mi><mi>n</mi><mi>l</mi><mi>y</mi><mi mathvariant="normal">&quot;</mi><mi>u</mi><mi>s</mi><mi>e</mi><msub><mi>r</mi><mi>n</mi></msub><mi>a</mi><mi>m</mi><mi>e</mi><mi mathvariant="normal">&quot;</mi><mi>i</mi><mi>n</mi></mrow><annotation encoding="application/x-tex">_COOKIE[&quot;user_name&quot;] will retain the value set by setcookie(&quot;user.name&quot; ...) and no amount of calling setcookie(&quot;user_name&quot; ...) will alter this value. This is rather trivially fixed by clearing the &quot;user.name&quot; cookie, but it can take a while to realize this since there&#x27;s only &quot;user_name&quot; in </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.0019em;vertical-align:-0.25em;"></span><span class="mord"><span></span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.07153em;">C</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">OO</span><span class="mord mathnormal" style="margin-right:0.07153em;">K</span><span class="mord mathnormal" style="margin-right:0.07847em;">I</span><span class="mord mathnormal" style="margin-right:0.05764em;">E</span><span class="mopen">[</span><span class="mord">&quot;</span><span class="mord mathnormal">u</span><span class="mord mathnormal">se</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">n</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">am</span><span class="mord mathnormal">e</span><span class="mord">&quot;</span><span class="mclose">]</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">re</span><span class="mord mathnormal">t</span><span class="mord mathnormal">ain</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">u</span><span class="mord mathnormal">ese</span><span class="mord mathnormal">t</span><span class="mord mathnormal">b</span><span class="mord mathnormal">yse</span><span class="mord mathnormal">t</span><span class="mord mathnormal">coo</span><span class="mord mathnormal">ki</span><span class="mord mathnormal">e</span><span class="mopen">(</span><span class="mord">&quot;</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.02778em;">ser</span><span class="mord">.</span><span class="mord mathnormal">nam</span><span class="mord mathnormal">e</span><span class="mord">&quot;...</span><span class="mclose">)</span><span class="mord mathnormal">an</span><span class="mord mathnormal">d</span><span class="mord mathnormal">n</span><span class="mord mathnormal">o</span><span class="mord mathnormal">am</span><span class="mord mathnormal">o</span><span class="mord mathnormal">u</span><span class="mord mathnormal">n</span><span class="mord mathnormal">t</span><span class="mord mathnormal">o</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">c</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">in</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">se</span><span class="mord mathnormal">t</span><span class="mord mathnormal">coo</span><span class="mord mathnormal">ki</span><span class="mord mathnormal">e</span><span class="mopen">(</span><span class="mord">&quot;</span><span class="mord mathnormal">u</span><span class="mord mathnormal">se</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">n</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">am</span><span class="mord mathnormal">e</span><span class="mord">&quot;...</span><span class="mclose">)</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">a</span><span class="mord mathnormal">lt</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mord mathnormal">t</span><span class="mord mathnormal">hi</span><span class="mord mathnormal">s</span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">u</span><span class="mord mathnormal">e</span><span class="mord">.</span><span class="mord mathnormal" style="margin-right:0.13889em;">T</span><span class="mord mathnormal">hi</span><span class="mord mathnormal">s</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.02778em;">sr</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">ia</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">i</span><span class="mord mathnormal">x</span><span class="mord mathnormal">e</span><span class="mord mathnormal">d</span><span class="mord mathnormal">b</span><span class="mord mathnormal">yc</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">in</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal">e</span><span class="mord">&quot;</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.02778em;">ser</span><span class="mord">.</span><span class="mord mathnormal">nam</span><span class="mord mathnormal">e</span><span class="mord">&quot;</span><span class="mord mathnormal">coo</span><span class="mord mathnormal">ki</span><span class="mord mathnormal">e</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal">u</span><span class="mord mathnormal">t</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">c</span><span class="mord mathnormal">an</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.03148em;">ak</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">hi</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mord mathnormal">t</span><span class="mord mathnormal">ore</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">i</span><span class="mord mathnormal">ze</span><span class="mord mathnormal">t</span><span class="mord mathnormal">hi</span><span class="mord mathnormal">ss</span><span class="mord mathnormal">in</span><span class="mord mathnormal">ce</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mord"><span class="mord mathnormal">e</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mord mathnormal">so</span><span class="mord mathnormal">n</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="mord">&quot;</span><span class="mord mathnormal">u</span><span class="mord mathnormal">se</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">n</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">am</span><span class="mord mathnormal">e</span><span class="mord">&quot;</span><span class="mord mathnormal">in</span></span></span></span>_COOKIE.

Hope this saves someone some time.

laffen ¶

16 years ago

Note that the $_COOKIE variable not will hold multiple cookies with the same name. It is legitimate to set two cookies with the same name to the same host where the sub domain is different. 
<?php
setcookie("testcookie", "value1hostonly", time(), "/", ".example.com", 0, true);
setcookie("testcookie", "value2subdom", time(), "/", "subdom.example.com", 0, true);
?>
The next request from the browser will have both cookies in the <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mrow></mrow><mi>S</mi></msub><mi>E</mi><mi>R</mi><mi>V</mi><mi>E</mi><mi>R</mi><msup><mo stretchy="false">[</mo><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mi>H</mi><mi>T</mi><mi>T</mi><msub><mi>P</mi><mi>C</mi></msub><mi>O</mi><mi>O</mi><mi>K</mi><mi>I</mi><msup><mi>E</mi><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mo stretchy="false">]</mo><mi>v</mi><mi>a</mi><mi>r</mi><mi>i</mi><mi>a</mi><mi>b</mi><mi>l</mi><mi>e</mi><mo separator="true">,</mo><mi>b</mi><mi>u</mi><mi>t</mi><mi>o</mi><mi>n</mi><mi>l</mi><mi>y</mi><mi>o</mi><mi>n</mi><mi>e</mi><mi>o</mi><mi>f</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>m</mi><mi>w</mi><mi>i</mi><mi>l</mi><mi>l</mi><mi>b</mi><mi>e</mi><mi>f</mi><mi>o</mi><mi>u</mi><mi>n</mi><mi>d</mi><mi>i</mi><mi>n</mi><mi>t</mi><mi>h</mi><mi>e</mi></mrow><annotation encoding="application/x-tex">_SERVER[&#x27;HTTP_COOKIE&#x27;] variable, but only one of them will be found in the </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.0019em;vertical-align:-0.25em;"></span><span class="mord"><span></span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.05764em;">S</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.00773em;">ER</span><span class="mord mathnormal" style="margin-right:0.22222em;">V</span><span class="mord mathnormal" style="margin-right:0.00773em;">ER</span><span class="mopen"><span class="mopen">[</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.08125em;">H</span><span class="mord mathnormal" style="margin-right:0.13889em;">TT</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.13889em;">P</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3283em;"><span style="top:-2.55em;margin-left:-0.1389em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.07153em;">C</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">OO</span><span class="mord mathnormal" style="margin-right:0.07153em;">K</span><span class="mord mathnormal" style="margin-right:0.07847em;">I</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.05764em;">E</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mclose">]</span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">iab</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mpunct">,</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal">b</span><span class="mord mathnormal">u</span><span class="mord mathnormal">t</span><span class="mord mathnormal">o</span><span class="mord mathnormal">n</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">yo</span><span class="mord mathnormal">n</span><span class="mord mathnormal">eo</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal">e</span><span class="mord mathnormal">m</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">ll</span><span class="mord mathnormal">b</span><span class="mord mathnormal">e</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">o</span><span class="mord mathnormal">u</span><span class="mord mathnormal">n</span><span class="mord mathnormal">d</span><span class="mord mathnormal">in</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal">e</span></span></span></span>_COOKIE variable. Requests to subdom.example.com will have both cookies, while browser request to example.com or www.example.com only sends the cookie with the "value1hostonly" value.

<?php <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>k</mi><mi>a</mi><mi>k</mi><mi>e</mi><mi>r</mi><mo>=</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>l</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo stretchy="false">(</mo><mi mathvariant="normal">&quot;</mi><mo separator="true">;</mo><mi mathvariant="normal">&quot;</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">kaker = explode(&quot;;&quot;, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.03148em;">kak</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen">(</span><span class="mord">&quot;</span><span class="mpunct">;</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord">&quot;</span><span class="mpunct">,</span></span></span></span>_SERVER['HTTP_COOKIE']);
foreach($kaker as $val){
    <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>k</mi><mo>=</mo><mi>e</mi><mi>x</mi><mi>p</mi><mi>l</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo stretchy="false">(</mo><mi mathvariant="normal">&quot;</mi><mo>=</mo><mi mathvariant="normal">&quot;</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">k = explode(&quot;=&quot;, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.03148em;">k</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen">(</span><span class="mord">&quot;</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord">&quot;</span><span class="mpunct">,</span></span></span></span>val);
    echo trim($k[0]) . " => " . $k[1];
}

// output
testcookie => value1hostonly
testcookie => value2subdom

?>

alexsvetalena at mail dot ru ¶

5 months ago

Please keep in mind that if you call setcookie() several times during the script execution (even for the same name, domain and path), then Set-Cookie header will be sent several times, and only after receiving all of them, client browser will "merge" them, replacing first value for the cookie with the next etc.

This may cause very large headers length sometimes, so you'll have to either increase buffers for your web server; change your code logic to determine all possibly-changing parameters values right from the start; implement some sort of global Response object keeping all the data, including cookies as well, till the end of processing (sort of optimized output beffering); or just avoid storing any large data in cookies.

steven at sovstack dot com ¶

10 months ago

As of PHP 7.3, you can use this syntax:

setcookie( <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">name,  </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">nam</span><span class="mord mathnormal">e</span><span class="mpunct">,</span></span></span></span>value,  $options)

Be aware that the array in $options is not fully compatible with array key names. In other words, the order of your array values matters regardless of the array key names.

<?PHP

// Correct (with key names):
setcookie(
    'my_cookie',
    'my_value',
    [
        'expires' => time() + 3600,
        'path' => '/',
    ]
);

// Correct (without key names):
setcookie(
    'my_cookie',
    'my_value',
    [
        time() + 3600, // expires
        '/' // path
    ]
);

// Incorrect Usage (wrong order as key names are ignored):
setcookie(
    'my_cookie',
    'my_value',
    [
        'path' => '/', // WRONG: should be 2nd
        'expires' => time() + 3600, // WRONG: should be 1st
    ]
);

// Here's the correct order of the $options array with default values:
$options = [
    'expires' => 0,
    'path' => "",
    'domain' => "",
    'secure' => false,
    'httponly' => false
];

setcookie(
    'my_cookie',
    'my_value',
    $options 
);

?>

If you do not provide options, the default values will be used.

PHP: setcookie - Manual (original) (raw)

Description

Parameters

Return Values

Changelog

Examples

Notes

See Also

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