A very simple and dirty class to make the GET and POST variables safe.

example.php

<?php

// We need to include the class.
require('safe_class.php');



// Here we specify the $_GET-variables as variables which can be used later.
list($foo, $bar) = safe::g('foo', 'bar');


// We can do the same with the $_POST-variables and can also specify a boolean as return type!
// Here, the variable $signin will either be true or false.
list($username, $password, $signin) = safe::p('username', 'password', 'signin: bool');

?>

safe_class.php

<?php

// The safe class to make GETS and POSTS safe.
class safe {
	public static function g() {
		$g = func_get_args();
		return self::make($_GET, $g);
	}
	
	public static function p() {
		$p = func_get_args();
		return self::make($_POST, $p);
	}
	
	private static function make(Array $t, Array $w) {
		foreach ($w as $v) {
			$v = explode(':', $v);
			if (isset($v[1]) && (trim($v[1]) === 'bool' xor trim($v[1]) === 'boolean')) {
				if (array_key_exists($v[0], $t)) {
					$r[$v[0]] = true;
				} else {
					$r[$v[0]] = false;
				}
			} else {
				if (array_key_exists($v[0], $t)) {
					$r[$v[0]] = (string)$t[$v[0]];
				} else {
					$r[$v[0]] = null;
				}
			}
		}
		return array_values($r);
	}
}

?>