Digits.php

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<?php

#require_once 'Zend/Filter/Interface.php';


class Zend_Filter_Digits implements Zend_Filter_Interface
{
    protected static $_unicodeEnabled;

    public function __construct()
    {
        if (null === self::$_unicodeEnabled) {
            self::$_unicodeEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;
        }
    }

    public function filter($value)
    {
        if (!self::$_unicodeEnabled) {
            // POSIX named classes are not supported, use alternative 0-9 match
            $pattern = '/[^0-9]/';
        } else if (extension_loaded('mbstring')) {
            // Filter for the value with mbstring
            $pattern = '/[^[:digit:]]/';
        } else {
            // Filter for the value without mbstring
            $pattern = '/[\p{^N}]/';
        }

        return preg_replace($pattern, '', (string) $value);
    }
}