Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in C:wampwwwAndroidPhpDemologin.php on line 9

<?php

$db_name="employes";
$mysql_username ="root";
$mysql_password ="";
$server_name ="localhost";
$conn = mysqli_connect($server_name,$mysql_username,$mysql_password,$db_name);

if ($conn) {
    echo "connection successful";
}
else{
    echo "connection not success";
}
  ?>

<?php
require "conn.php";
$user_name = "hacen";
$user_pass = "1234";
$mysql_qry = "SELECT * FROM employe_data WHERE user_name LIKE '$user_name' AND password '$user_pass';";

$result = mysqli_query($conn ,$mysql_qry);

if (mysqli_num_rows($result) > 0) {
    echo "login success";
}else{
    echo "login not  success";
}

 ?>