Online PHP editor | output for WQl1Q

<?php function getPatientCodeDisplay($id='') { $retstr = ""; if(intval($id)>0) { $max_id_length = 6; $id_length = strlen($id); if($id_length <= $max_id_length) { $prefix_code = "AH_D_D"; $final_len = $max_id_length+strlen($prefix_code)-$id_length; $retstr = str_pad($prefix_code, $final_len, "0", STR_PAD_RIGHT); $retstr .= $id; } } return $retstr; } echo getPatientCodeDisplay(1)." >> "; echo getPatientCodeDisplay(12)." >> "; echo getPatientCodeDisplay(123)." >> "; echo getPatientCodeDisplay(1234)." >> "; echo getPatientCodeDisplay(12345)." >> "; echo getPatientCodeDisplay(123456)." >> "; echo getPatientCodeDisplay(1234567)." >> ";