Definition: Unset () is used to destroy a variable in PHP. In can be used to remove a single variable, multiple variables, or an element from an array. It is phrased as Unset ($remove).
Also Known As: Unset Variable, Destroy Variable
Examples:
<?php
// remove a single variable
unset($a);
// remove a single element in an array
unset($my_array['element']);
// remove multiple variables
unset($a, $b, $c);
?> 