title: include_once(db-config.php): failed to open stream: No such file or directory
body: <p>I am facing error while creating a user login and registration page. Here is my code. Error screenshot is attached.</p>
  
  <p><strong>db-config.php</strong></p>
  
  <pre><code>&lt;?php 
  define("HOST", "localhost"); 
  define("USER", "sec_user");
  define("PASSWORD", "eKcGZr59zAa2BEWU");
  define("DATABASE", "sumerian");
  ?&gt;
  </code></pre>
  
  <p><strong>db-connection.php</strong></p>
  
  <pre><code>&lt;?php
  include_once("db‐config.php"); // As functions.php is not included
  $mysqli = new mysqli(HOST, USER, PASSWORD, DATABASE);
  ?&gt;
  </code></pre>
  
  <p><strong>login.php</strong></p>
  
  <pre><code>&lt;?php
  include_once 'db-connection.php';
  include_once 'php-functions.php';
  sec_session_start(); //function for session
  if (login_check($mysqli) == true) 
  {
      $logged = 'in';
  } 
  else 
  {
     $logged = 'out';
  }
  ?&gt;
  //html content goes here
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ejMp6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ejMp6.png" alt="error screenshot"></a></p>