Str::contains PHP Метод

    public static function contains($haystack, $needle)
    {
        return false !== strpos($haystack, $needle);
    }

 public static function init()
 {
     if (!static::$initialized) {
         $sessionTimeLimit = 20 * 60;
         session_set_cookie_params($sessionTimeLimit);
         session_start();
         // Verify if session already is valid
         $keyDiscardTime = '___discard_after___';
         $now = time();
         if (isset($_SESSION[$keyDiscardTime]) && $now > $_SESSION[$keyDiscardTime]) {
             // this session has worn out its welcome; kill it and start a brand new one
             session_unset();
             session_destroy();
             session_start();
         }
         // either new or old, it should live at most for another hour
         $_SESSION[$keyDiscardTime] = $now + $sessionTimeLimit;
         static::$initialized = true;
         //Clear all old flash data
         foreach ($_SESSION as $k => $v) {
             if (Str::contains($k, ":old:")) {
                 static::clear($k);
             }
         }
         //Set all new flash data as old, to be cleared on the next request
         foreach ($_SESSION as $k => $v) {
             $parts = explode(":new:", $k);
             if (is_array($parts) && count($parts) == 2) {
                 $newKey = "flash:old:" . $parts[1];
                 static::set($newKey, $v);
                 static::clear($k);
             }
         }
     }
 }