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PHP unset function

PHP : unset() function

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Description

The unset() function destroys a given variable.

Version

(PHP 4 and above)

Syntax

unset (var1, var2.... )

Parameters

Name Description Required /
Optional
Type
var1 The variable to be unset. Required Mixed*
var2 Another variable to be unset Optional Mixed*

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value

No value is returned.

Example - 1 :

<?php
$xyz='w3resource.com';
echo 'Before using unset() the value of $xys is : '. $xyz.'<br>';
unset($xyz);
echo 'After using unset() the value of $xys is : '. $xyz;
?>

Output :

Before using unset() the value of $xys is : w3resource.com
After using unset() the value of $xys is :

View the example in the browser

Practice here online :

 

Example - 2 :

<?php
function destroy_variable()
{
unset($GLOBALS['w3resource']);
}
$w3resource='Php Tutorial';
destroy_variable();
echo $w3resource;
?> 
    

View the example in the browser

See also

PHP Function Reference



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