The functions and classes in PHP have global scope. This means they could be called outside a function even after they were defined inside the scope and the other way round.
But PHP doesn't support function overloading, and it is not possible to redefine previously-declared functions.
The function can be defined as an anonymous function and it can be unset after it completes its run.
Below is a code sample for the same −
if (function_exists('get_magic_quotes_gpc') && @get_magic_quotes_gpc()) $my_fn = create_function('&$v, $k', '$v = stripslashes($v);'); array_walk_recursive(array(&$_GET, &$_POST, &$_COOKIE, &$_REQUEST), $my_fn); unset($my_fn); }
An anonymous function can't be called inside itself. The workaround is to use array_walk_recursive.