Hex.php

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<?php
#require_once 'Zend/Validate/Abstract.php';

class Zend_Validate_Hex extends Zend_Validate_Abstract
{
    const INVALID = 'hexInvalid';
    const NOT_HEX = 'notHex';

    protected $_messageTemplates = array(
        self::INVALID => "Invalid type given. String expected",
        self::NOT_HEX => "'%value%' has not only hexadecimal digit characters",
    );

    public function isValid($value)
    {
        if (!is_string($value) && !is_int($value)) {
            $this->_error(self::INVALID);
            return false;
        }

        $this->_setValue($value);
        if (!ctype_xdigit((string) $value)) {
            $this->_error(self::NOT_HEX);
            return false;
        }

        return true;
    }

}