"self::method"       -> self::class . "::method"
"parent::method"     -> parent::class . "::method"
"static::method"     -> static::class . "::method"
["self", "method"]   -> [self::class, "method"]
["parent", "method"] -> [parent::class, "method"]
["static", "method"] -> [static::class, "method"]

		// Block common bad agents / queries / php issues.
		array_walk($_SERVER,  [self::class, "filter_request"] , '_SERVER');
		if (isset($_GET))
		{
			array_walk($_GET, [self::class, "filter_request"], '_GET');
		}
		if (isset($_POST))
		{
			array_walk($_POST,   [self::class, "filter_request"], '_POST');
			reset($_POST);		// Change of behaviour in PHP 5.3.17?
		}
		if (isset($_COOKIE))
		{
			array_walk($_COOKIE, [self::class, "filter_request"], '_COOKIE');
		}
		if (isset($_REQUEST))
		{
			array_walk($_REQUEST, [self::class, "filter_request"], '_REQUEST');
		}