PHP: unset() function
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 alsoPrevious: unserialize
Next: var_dump