Digits.php

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

class Zend_Validate_Digits extends Zend_Validate_Abstract
{
    const NOT_DIGITS   = 'notDigits';
    const STRING_EMPTY = 'digitsStringEmpty';
    const INVALID      = 'digitsInvalid';

    protected static $_filter = null;

    protected $_messageTemplates = array(
        self::NOT_DIGITS   => "'%value%' must contain only digits",
        self::STRING_EMPTY => "'%value%' is an empty string",
        self::INVALID      => "Invalid type given. String, integer or float expected",
    );

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

        $this->_setValue((string) $value);

        if ('' === $this->_value) {
            $this->_error(self::STRING_EMPTY);
            return false;
        }

        if (null === self::$_filter) {
            #require_once 'Zend/Filter/Digits.php';
            self::$_filter = new Zend_Filter_Digits();
        }

        if ($this->_value !== self::$_filter->filter($this->_value)) {
            $this->_error(self::NOT_DIGITS);
            return false;
        }

        return true;
    }
}