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.htmlCheers, -b

