array_map_recursive

Not much needs to be said here.

function array_map_recursive($callback, $arr) {
	$ret = array();
	foreach($arr as $key => $val) {
		if(is_array($val)) $ret[$key] = array_map_recursive($callback, $val);
		else $ret[$key] = $callback($val);
	}
	return $ret;
}

I wrote this so that I could do this...

$filters = array('htmlspecialchars', 'nl2br');
foreach($filters as $filter) $view_vars = array_map_recursive($filter, $view_vars);

Which just sanitizes my variables before I print them.