Can not execute the MySQL query using PHP and MySQL -

i have issue when executing sql query.i explaining code below.

complain.php:

require_once("./include/dbconfig.php"); if($_request['typeofapp']=="web"){         $sent_form="web";         $ticket_id=generateticketid('w1');      }  function generateticketid($code){         $sql="select * db_ticket order id desc ";         $qrylast=mysqli_query($con,$sql);         echo mysqli_num_rows($qrylast);exit; } 

here trying check number of rows.but not getting anything.i giving dbconfig.php below.

dbconfig.php

$con = new mysqli("localhost", "root", "****", "************");  if ($con->connect_error)die("connection failed: ");  

here need check no of rows present inside table.please me.

you need define connection variable global have access in inside function or need pass in function parameter

require_once("./include/dbconfig.php"); //global $con; if($_request['typeofapp']=="web"){         $sent_form="web";         $ticket_id=generateticketid('w1',$con);// pass connection variable      } 

pass $con variable parameter , function need return value

function generateticketid($code, $con) {     $sql = "select * db_ticket order id desc ";     $qrylast = mysqli_query($con, $sql);     $rows = mysqli_num_rows($qrylast);     if($rows>0){         return $rows;     }else{         return false     } } 

http://php.net/manual/en/language.variables.scope.php