PHP: stristr - Manual (original) (raw)
(PHP 4, PHP 5, PHP 7, PHP 8)
stristr — Case-insensitive strstr()
Description
Parameters
haystack
The string to search in
needle
The string to search for.
Prior to PHP 8.0.0, if needle is not a string, it is converted to an integer and applied as the ordinal value of a character. This behavior is deprecated as of PHP 7.3.0, and relying on it is highly discouraged. Depending on the intended behavior, theneedle should either be explicitly cast to string, or an explicit call to chr() should be performed.
before_needle
If [true](reserved.constants.php#constant.true), stristr() returns the part of the haystack before the first occurrence of the needle (excluding needle).
needle and haystack are examined in a case-insensitive manner.
Return Values
Returns the matched substring. If needle is not found, returns [false](reserved.constants.php#constant.false).
Changelog
| Version | Description |
|---|---|
| 8.2.0 | Case folding no longer depends on the locale set withsetlocale(). Only ASCII case folding will be done. Non-ASCII bytes will be compared by their byte value. |
| 8.0.0 | needle now accepts an empty string. |
| 8.0.0 | Passing an int as needle is no longer supported. |
| 7.3.0 | Passing an int as needle has been deprecated. |
Examples
Example #1 stristr() example
<?php
$email = 'USER@EXAMPLE.com';
echo stristr($email, 'e'), PHP_EOL; // outputs ER@EXAMPLE.com
echo stristr($email, 'e', true), PHP_EOL; // outputs US
?>Example #2 Testing if a string is found or not
<?php
$string = 'Hello World!';
if (stristr($string, 'earth') === FALSE) {
echo '"earth" not found in string';
}
// outputs: "earth" not found in string
?>Notes
Note: This function is binary-safe.
See Also
- strstr() - Find the first occurrence of a string
- strrchr() - Find the last occurrence of a character in a string
- stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
- strpbrk() - Search a string for any of a set of characters
- preg_match() - Perform a regular expression match
Found A Problem?
23 years ago
There was a change in PHP 4.2.3 that can cause a warning message
to be generated when using stristr(), even though no message was
generated in older versions of PHP.
The following will generate a warning message in 4.0.6 and 4.2.3:
stristr("haystack", "");
OR
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>n</mi><mi>e</mi><mi>e</mi><mi>d</mi><mi>l</mi><mi>e</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi mathvariant="normal">"</mi><mo separator="true">;</mo><mi>s</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>s</mi><mi>t</mi><mi>r</mi><mo stretchy="false">(</mo><mi mathvariant="normal">"</mi><mi>h</mi><mi>a</mi><mi>y</mi><mi>s</mi><mi>t</mi><mi>a</mi><mi>c</mi><mi>k</mi><mi mathvariant="normal">"</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">needle = ""; stristr("haystack", </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">n</span><span class="mord mathnormal">ee</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</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">""</span><span class="mpunct">;</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal">s</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">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mopen">(</span><span class="mord">"</span><span class="mord mathnormal">ha</span><span class="mord mathnormal">ys</span><span class="mord mathnormal">t</span><span class="mord mathnormal">a</span><span class="mord mathnormal">c</span><span class="mord mathnormal" style="margin-right:0.03148em;">k</span><span class="mord">"</span><span class="mpunct">,</span></span></span></span>needle);
This will _not_ generate an "Empty Delimiter" warning message in
4.0.6, but _will_ in 4.2.3:
unset($needle); stristr("haystack", $needle);
Here's a URL that documents what was changed:
http://groups.google.ca/groups?selm=cvshholzgra1031224321%40cvsserver18 years ago
Just been caught out by stristr trying to converting the needle from an Int to an ASCII value.
Got round this by casting the value to a string.
<?php
if( !stristr( <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mi>i</mi><mi>l</mi><mi>e</mi><mo separator="true">,</mo><mo stretchy="false">(</mo><mi>s</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>n</mi><mi>g</mi><mo stretchy="false">)</mo></mrow><annotation encoding="application/x-tex">file, (string) </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 mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">i</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="mopen">(</span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</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="mclose">)</span></span></span></span>myCustomer->getCustomerID() ) ) {
// Permission denied
}
?>Techdeck at Techdeck dot org ¶
23 years ago
An example for the stristr() function:
<?php
$a = "I like php";
if (stristr("$a", "LikE PhP")) {
print ("According to \$a, you like PHP.");
}
?>
It will look in $a for "like php" (NOT case sensetive. though, strstr() is case-sensetive).
For the ones of you who uses linux.. It is similiar to the "grep" command.
Actually.. "grep -i".notepad at codewalkers dot com ¶
21 years ago
<?php
function stristr_reverse($haystack, $needle) {
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>p</mi><mi>o</mi><mi>s</mi><mo>=</mo><mi>s</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>p</mi><mi>o</mi><mi>s</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">pos = stripos(</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">p</span><span class="mord mathnormal">os</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">s</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">p</span><span class="mord mathnormal">os</span><span class="mopen">(</span></span></span></span>haystack, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>n</mi><mi>e</mi><mi>e</mi><mi>d</mi><mi>l</mi><mi>e</mi><mo stretchy="false">)</mo><mo>+</mo><mi>s</mi><mi>t</mi><mi>r</mi><mi>l</mi><mi>e</mi><mi>n</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">needle) + strlen(</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 mathnormal">n</span><span class="mord mathnormal">ee</span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mclose">)</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mord mathnormal">n</span><span class="mopen">(</span></span></span></span>needle);
return substr($haystack, 0, $pos);
}
$email = 'USER@EXAMPLE.com';
echo stristr_reverse($email, 'er');
// outputs USER
?>12 years ago
I think there is a bug in php 5.3 in stristr with uppercase Ä containing other character
http://pastebin.com/5bP6uztY
if you search only with täry it works, but as soon as the word is tärylä it does not. TÄRYL works fine