title: How to add php files in drupal modules
body: <p>I have a folder <code>/sites/main_folder/modules/file_folder/file.php</code></p>
  
  <p>I need to add file.php in the target.module file
  <code>/sites/main_folder/modules/target_folder/target.module</code>. What is the perfect code for that?</p>
  
  <p>I wrote this code in my callback function to add file.php in my target.module file but nothing happened:</p>
  
  <pre><code>$path=base_path().drupal_get_path("module","file_folder")."/"; 
  require_once($path."file.php");
  </code></pre>