check valid phone number format

gistfile1.php

function _check_phone_number($string, &$data = null ) {
    if ( preg_match( '/^[+]?([\d]{0,3})?[\(\.\-\s]?([\d]{3})[\)\.\-\s]*([\d]{3})[\.\-\s]?([\d]{4})$/', $string, $mm ) ) {
        $data = $mm;
        return true;
    }
    // 13102016: malaysia format 00-000 000 00-000000
    if ( preg_match( '/^[+]?([\d]{0,2})?[\(\.\-\s]?([\d]{2})[\)\.\-\s]*([\d]{2})[\.\-\s]?([\d]{4})$/', $string, $mm ) ) {
        $data = $mm;
        return true;
    }
    if ( _num($string) && strlen($string) >= 7 ) return true;
    return false;
}