How to get Login successful alert to trigger only one time after signing in

<div class="row">
   <div class="small-4 small-centered columns">
            
        <?php if (isset($_SESSION['user'])) { ?> 

                <div data-alert class="alert-box success radius">

                  Login successful!
                    
                <a href="#" class="close">&times;</a></div>
                

         <?php } elseif (isset($_SESSION['login_error'])) { ?>

                <div data-alert class="alert-box alert round">

                  <?php print $_SESSION['login_error']; ?>

                <a href="#" class="close">&times;</a></div>
                

            <?php } ?>

      </div>
  </div>

When $_Session[‘user’] has been set I want the ‘Login successful’ message to appear only once after signing in. If I refresh the page or click an anchor message will reappear, which is to be expected. If anyone knows a better way of doing this or if it is possible only in php.

Answer

you must set a observer value to see whether the value you want to be able to hide is active or not. this code should help.

<?PHP 
 session_start(); 

 $_SESSION['login_status']=false; 

 ?>

  <div class="small-4 small-centered columns">

      <?php if($_SESSION['login_status']==false){  ?>

              <?php if (isset($_SESSION['user'])) { ?>

                    <div data-alert class="alert-box success radius">
                        Login succesful!
                        <a href="#" class="close">&times;</a>
                    </div>

                    <?php  $_SESSION['login_status']=true;  ?>


            <?php } elseif (isset($_SESSION['login_error'])) { ?>

                  <div data-alert class="alert-box alert round">

                      <?php print $_SESSION['login_error']; ?>

                      <a href="#" class="close">&times;</a>
                  </div>
            <?php } ?>

      <?php } ?>

  </div>