3v4l.org

run code in 300+ PHP versions simultaneously
<?php //$phone = "841657196818"; //$phone = "841657336818"; if(preg_match("/^([1-9]{2})[0-9]{8|9|10}$/", $phone)) { echo "$phone Valid"; } else { echo "$phone Invalid."; }

preferences:
36.79 ms | 402 KiB | 5 Q