Float.php

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

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

class Zend_Validate_Float extends Zend_Validate_Abstract
{
    const INVALID   = 'floatInvalid';
    const NOT_FLOAT = 'notFloat';

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

    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');
            }
        }

        $this->setLocale($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_float($value)) {
            return true;
        }

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

        return true;
    }
}