destroys the specified variables.

unset() -

Unset a given variable.

   Description

                   void unset ( mixed $var [, mixed $... ] )

unset() destroys the specified variables.

The behavior of unset() inside of a function can vary depending on what type of variable you are attempting to destroy.

If a globalized variable is unset() inside of a function, only the local variable is destroyed. The variable in the calling environment will retain the same value as before unset() was called.

Example:

<?php
function destroy_foo()
{
    global $foo;
    unset($foo);
}

$foo = 'bar';
destroy_foo();
echo $foo;

?>

Output:

   bar