Online PHP editor | output for XBY8v

<?php function processMobileNumber($number = '') { // Removing non number chars from the number $cleanNumber = str_replace("(","", $number); $cleanNumber = str_replace(")","", $cleanNumber); $cleanNumber = str_replace("-","", $cleanNumber); $cleanNumber = str_replace(".","", $cleanNumber); $cleanNumber = str_replace(" ","", $cleanNumber); if (is_numeric($cleanNumber)) { //Phone number must start with a 1. if (substr($cleanNumber,0,1)==="1") { $msisdn = $cleanNumber; } else { $msisdn = "1" . $cleanNumber; } } else { $msisdn = 0; } return $msisdn; } echo(processMobileNumber(234));