Int.php

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

#require_once 'Zend/Locale/Format.php';

class Zend_Validate_Int extends Zend_Validate_Abstract
{
    const INVALID = 'intInvalid';
    const NOT_INT = 'notInt';

    protected $_messageTemplates = array(
        self::INVALID => "Invalid type given. String or integer expected",
        self::NOT_INT => "'%value%' does not appear to be an integer",
    );

    protected $_locale;

    public function __construct($locale = null)
    {
        if ($locale instanceof Zend_Config) {
            $locale = $locale->toArray();
        }

        if (is_array($locale)) {
            if (array_key_exists('locale', $locale)) {
                $locale = $locale['locale'];
            } else {
                $locale = null;
            }
        }

        if (empty($locale)) {
            #require_once 'Zend/Registry.php';
            if (Zend_Registry::isRegistered('Zend_Locale')) {
                $locale = Zend_Registry::get('Zend_Locale');
            }
        }

        if ($locale !== null) {
            $this->setLocale($locale);
        }
    }

    public function getLocale()
    {
        return $this->_locale;
    }

    public function setLocale($locale = null)
    {
        #require_once 'Zend/Locale.php';
        $this->_locale = Zend_Locale::findLocale($locale);
        return $this;
    }

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

        if (is_int($value)) {
            return true;
        }

        $this->_setValue($value);
        if ($this->_locale === null) {
            $locale        = localeconv();
            $valueFiltered = str_replace($locale['decimal_point'], '.', $value);
            $valueFiltered = str_replace($locale['thousands_sep'], '', $valueFiltered);

            if (strval(intval($valueFiltered)) != $valueFiltered) {
                $this->_error(self::NOT_INT);
                return false;
            }

        } else {
            try {
                if (!Zend_Locale_Format::isInteger($value, array('locale' => $this->_locale))) {
                    $this->_error(self::NOT_INT);
                    return false;
                }
            } catch (Zend_Locale_Exception $e) {
                $this->_error(self::NOT_INT);
                return false;
            }
        }

        return true;
    }
}