Класс Error

class Error extends \Exception { … }

    var $messages = array();

    function __construct($error) {
        if (is_array($error)) {
            parent::__construct(array_shift($error));
            $this->addError($error);
        } else {
            parent::__construct($error);
        }
    }

    function __toString() {
        if (count($this->messages)) return implode("\n", $this->messages);
        else return $this->getMessage();
    }

    function getError() {
        return $this;
    }

    function setError($error) {
        if ($this !== $error) $this->messages = is_array($error) ? $error : array($error);
        else $this->messages = array();
        return $this;
    }

    function addError($error) {
        if (!count($this->messages)) $this->messages[] = $this->getError()->__toString();
        if (is_array($error)) foreach ($error as $e) {
            if ($this !== $e) $this->messages[] = $e;
        } else {
            if ($this !== $error) $this->messages[] = $error;
        }
        return $this;
    }