unset

Definition and usage

The unset() function clears the specified variable.

Example

Destroy variables:

 <?php  
$a = "Hello world!" ;  
echo "Delete the value of the previous variable 'a': " . $a . "<br>" ;  
unset ( $a ) ;  
echo "The value of the variable 'a' after deletion: " . $a ;  
?>

Try it yourself

grammar

 unset ( variable , ... . ) ;