core-bundle/src/Resources/contao/library/Contao/Input.php
public static function initialize()
	{
		$_GET    = static::cleanKey($_GET);
		$_POST   = static::cleanKey($_POST);
		$_COOKIE = static::cleanKey($_COOKIE);
	}
public static function initialize()
	{
		$_GET    = static::cleanKey($_GET);
		$_POST   = static::cleanKey($_POST);
		$_COOKIE = static::cleanKey($_COOKIE);
	}
Clean the global GPC arrays