PHP: Hypertext Preprocessor (original) (raw)

settype

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

settype — Set the type of a variable

Description

Parameters

var

The variable being converted.

type

Possibles values of type are:

"boolean" or "bool"
"integer" or "int"
"float" or "double"
"string"
"array"
"object"
"null"

Return Values

Returns [true](reserved.constants.php#constant.true) on success or [false](reserved.constants.php#constant.false) on failure.

Examples

Example #1 settype() example

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mathvariant="normal">/</mi><mi mathvariant="normal">/</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>b</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>o</mi><mi>o</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mi>s</mi><mi>t</mi><mi>y</mi><mi>l</mi><mi>e</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>a</mi><mi>r</mi><mi>g</mi><mi>i</mi><mi>n</mi><mo>−</mo><mi>r</mi><mi>i</mi><mi>g</mi><mi>h</mi><mi>t</mi><mo>:</mo><mn>0.01968</mn><mi>e</mi><mi>m</mi><mo separator="true">;</mo><mi mathvariant="normal">"</mi><mo>></mo><mi>l</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>e</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>a</mi><mi>n</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>s</mi><mi>e</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>t</mi><mi>t</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mi>s</mi><mi>t</mi><mi>y</mi><mi>l</mi><mi>e</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>a</mi><mi>r</mi><mi>g</mi><mi>i</mi><mi>n</mi><mo>−</mo><mi>r</mi><mi>i</mi><mi>g</mi><mi>h</mi><mi>t</mi><mo>:</mo><mn>0.03588</mn><mi>e</mi><mi>m</mi><mo separator="true">;</mo><mi mathvariant="normal">"</mi><mo>></mo><mi>y</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>p</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>r</mi><mi>d</mi><mi>m</mi><mi>a</mi><mi>t</mi><mi>h</mi><mi>n</mi><mi>o</mi><mi>r</mi><mi>m</mi><mi>a</mi><mi>l</mi><mi mathvariant="normal">"</mi><mo>></mo><mi>e</mi><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>=</mo><mi mathvariant="normal">"</mi><mi>m</mi><mi>o</mi><mi>p</mi><mi>e</mi><mi>n</mi><mi mathvariant="normal">"</mi><mo>></mo><mo stretchy="false">(</mo><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mo><</mo><mi mathvariant="normal">/</mi><mi>s</mi><mi>p</mi><mi>a</mi><mi>n</mi><mo>></mo><mi>f</mi><mi>o</mi><mi>o</mi><mo separator="true">,</mo><mi mathvariant="normal">"</mi><mi>i</mi><mi>n</mi><mi>t</mi><mi>e</mi><mi>g</mi><mi>e</mi><mi>r</mi><mi mathvariant="normal">"</mi><mo stretchy="false">)</mo><mo separator="true">;</mo><mi mathvariant="normal">/</mi><mi mathvariant="normal">/</mi></mrow><annotation encoding="application/x-tex">foo = "5bar"; // string <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>a</mi><mi>r</mi><mo>=</mo><mi>t</mi><mi>r</mi><mi>u</mi><mi>e</mi><mo separator="true">;</mo><mi mathvariant="normal">/</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>o</mi><mi>o</mi><mi>l</mi><mi>e</mi><mi>a</mi><mi>n</mi><mi>s</mi><mi>e</mi><mi>t</mi><mi>t</mi><mi>y</mi><mi>p</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">bar = true; // booleansettype(</annotation></semantics></math>bar=true;//booleansettype(foo, "integer"); // </annotation></semantics></math>foo="5bar";//string<spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>a</mi><mi>r</mi><mo>=</mo><mi>t</mi><mi>r</mi><mi>u</mi><mi>e</mi><moseparator="true">;</mo><mimathvariant="normal">/</mi><mimathvariant="normal">/</mi><mi>b</mi><mi>o</mi><mi>o</mi><mi>l</mi><mi>e</mi><mi>a</mi><mi>n</mi><mi>s</mi><mi>e</mi><mi>t</mi><mi>t</mi><mi>y</mi><mi>p</mi><mi>e</mi><mostretchy="false">(</mo></mrow><annotationencoding="application/x−tex">bar=true;//booleansettype(</annotation></semantics></math></span><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.6944em;"></span><spanclass="mordmathnormal">ba</span><spanclass="mordmathnormal"style="margin−right:0.02778em;">r</span><spanclass="mspace"style="margin−right:0.2778em;"></span><spanclass="mrel">=</span><spanclass="mspace"style="margin−right:0.2778em;"></span></span><spanclass="base"><spanclass="strut"style="height:1em;vertical−align:−0.25em;"></span><spanclass="mordmathnormal">t</span><spanclass="mordmathnormal"style="margin−right:0.02778em;">r</span><spanclass="mordmathnormal">u</span><spanclass="mordmathnormal">e</span><spanclass="mpunct">;</span><spanclass="mspace"style="margin−right:0.1667em;"></span><spanclass="mord">//</span><spanclass="mordmathnormal">b</span><spanclass="mordmathnormal">oo</span><spanclass="mordmathnormal"style="margin−right:0.01968em;">l</span><spanclass="mordmathnormal">e</span><spanclass="mordmathnormal">an</span><spanclass="mordmathnormal">se</span><spanclass="mordmathnormal">tt</span><spanclass="mordmathnormal"style="margin−right:0.03588em;">y</span><spanclass="mordmathnormal">p</span><spanclass="mordmathnormal">e</span><spanclass="mopen">(</span></span></span></span>foo,"integer");//foo is now 5 (integer) settype($bar, "string"); // $bar is now "1" (string) ?>

Found A Problem?

Special Notes ¶

13 years ago

`Note that you can't use this to convert a string 'true' or 'false' to a boolean variable true or false as a string 'false' is a boolean true. The empty string would be false instead...

robin at barafranca dot com ¶

17 years ago

`Just a quick note, as this caught me out very briefly:

settype() returns bool, not the typecasted variable - so: blah=settype(blah = settype(blah=settype(blah, "int"); // is wrong, changes $blah to 0 or 1
settype($blah, "int"); // is correct

Hope this helps someone else who makes a mistake.. ;)

DarkMaster ¶

4 years ago

<?php /* This example works 4x faster than settype() function in PHP-CGI 5.4.13 and 8x faster in PHP-CGI 7.1.3(x64) for windows */$v = '12345';$v = (int)$v; <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>v</mi><mo>=</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">v = (string)</annotation></semantics></math>v=(string)v;?>

sdibb at myway dot com ¶

21 years ago

`Using settype is not the best way to convert a string into an integer, since it will strip the string wherever the first non-numeric character begins. The function intval($string) does the same thing.

If you're looking for a security check, or to strip non-numeric characters (such as cleaning up phone numbers or ZIP codes), try this instead:

number=eregreplace("[0−9]","",number=ereg_replace("[^0-9]","",number=eregreplace("[0−9]","",number); ?>

nospamplease at veganismus dot ch ¶

19 years ago

you must note that this function will not set the type permanently! the next time you set the value of that variable php will change its type as well.

geoffsmiths at hotmail dot com ¶

5 years ago

`Please note:

When using settype to convert indexed arrays to objects, the properties of the typed object will be integers:

A brief example:

$a = ['1', '2'];

settype($a, 'object');

var_dump($a);

// output
object(stdClass)#1 (2) {
["0"]=>
string(1) "1"
["1"]=>
string(1) "2"
}

matt at mattsoft dot net ¶

19 years ago

using (int) insted of the settype function works out much better for me. I have always used it. I personally don't see where settype would ever come in handy.

Anonymous ¶

6 years ago

`If you attempt to convert the special $this variable from an instance method (only in classes) :

PHP will silently return TRUE and leave $this unchanged if the type was 'bool', 'array', 'object' or 'NULL'
PHP will generate an E_NOTICE if the type was 'int', 'float' or 'double', and $this will not be casted
PHP will throw a catchable fatal error when the type is 'string' and the class does not define the __toString() method
Unless the new variable type passed as the second argument is invalid, settype() will return TRUE. In all cases the object will remain unchanged. test(); ?>Here is the result :
Type Succeed? Converted
bool 1 Foo Object
(
)

Notice: Object of class Foo could not be converted to int in C:\php\examples\oop-settype-this.php on line 9

int 1 Foo Object
(
)

Notice: Object of class Foo could not be converted to float in C:\php\examples\oop-settype-this.php on line 10

float 1 Foo Object
(
)

array 1 Foo Object
(
)

object 1 Foo Object
(
)

Warning: settype(): Invalid type in C:\php\examples\oop-settype-this.php on line 14

unknowntype Foo Object
(
)

NULL 1 Foo Object
(
)

Catchable fatal error: Object of class Foo could not be converted to string in C:\php\examples\oop-settype-this.php on line 15

If the class Foo implements __toString() :

So the first code snippet will not generate an E_RECOVERABLE_ERROR, but instead print the same string as for the other types, and not look at the one returned by the __toString() method.

Hope this helps ! :)

ns at canada dot com ¶

24 years ago

`This settype() behaviour seems consistent to me. Quoting two sections from the manual:

"When casting from a scalar or a string variable to an array, the variable will become the first element of the array: "

  
2 $var = 'ciao';  
3 arr=(array)arr = (array) arr=(array)var;  
4 echo $arr[0]; // outputs 'ciao'

And if (like your code above) you do a settype on an empty variable, you'll end up with a one element array with an empty (not unset!) first element. So appeanding to it will start appending at index 1. As for why reset() doesn't do anything:

"When you assign a value to an array variable using empty brackets, the value will be added onto the end of the array."

It doesn't matter where the array counter is; values are added at the end, not at the counter.