Uri.php

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<?php

class Robo47_Validate_Uri extends Zend_Validate_Abstract
{
    const NO_VALID_URI = 'noValidUri';

    protected $_messageTemplates = array(
        self::NO_VALID_URI => "URI '%value%' is not valid: '%message%'"
    );
    protected $_messageVariables = array(
        'message' => '_message',
        'value' => '_value'
    );
    protected $_message = '';

    public function isValid($value)
    {
        $this->_setValue($value);
        try {
            $uri = Zend_Uri::factory($value);
        } catch (Exception $e) {
            $this->_message = $e->getMessage();
            $this->_error(self::NO_VALID_URI, $value);
            return false;
        }
        return $uri->valid();
    }
}