Register.php กับ login.php ผมเขียนโค้ดแบบนี้ถูกไหมครับ

<?php  
 require "init.php"; 
 $user_name = $_POST["user_name"];  
 $user_pass =  $_POST["user_pass"];  
 $sql_query = "select name from user_info where user_name like '$user_name' and user_pass like '$user_pass';";  
 $result = mysqli_query($con,$sql_query);  
 if(mysqli_num_rows($result) >0 )  
 {  
 $row = mysqli_fetch_assoc($result);  
 $name =$row["name"];  
 echo "Login Success..Welcome ".$name;  
 }  
 else  
 {   
 echo "Login Failed.......Try Again..";  
 }  
 ?> 

<?php  
 require "init.php";  
 $name = $_POST["user"];  
 $user_name = $_POST["user_name"];  
 $user_pass = $_POST["user_pass"];  
 $sql_query = "insert into user_info values('$name','$user_name','$user_pass');";  
 ?>  


ผมดึงค่าจาก init.php ครับ
<?php  
 $db_name = "webappdb";  
 $mysql_user = "root";  
 $mysql_pass = "";  
 $server_name = "localhost";  
 $con = mysqli_connect($server_name,$mysql_user,$mysql_pass,$db_name);  
 
 {echo "connected";
 }
 ?>