Thanks everyone. I guess I find the answer:

*    // return true if the $str ONLY consists of Arabic characters and
space-character
    public function isArabicString($str)
    {
        return preg_match('/^([\p{Arabic}]|\s)*$/u', $str);
    }
*
PHP 5.1.x or higher is required.
@see: http://www.regular-expressions.info/unicode.html

Cheers,
-b

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