title: $_REQUEST in PHP
body: <p>I have this code.</p>
  
  <pre><code>$message = "";
  
  if($_REQUEST['msg'] == "new"){
      $message = "New User has been added successfully";
  }else if($_REQUEST['msg'] == 'edit'){
      $message = "User has been saved successfully";
  }else if($_REQUEST['msg'] == 'update'){
      $message = "User(s) has been Updated successfully";
  }
  </code></pre>
  
  <p>can any one please tell me here what is <strong>['msg']</strong> and please explain the functioning of $_REQUEST?</p>