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http://stackoverflow.com/questions/4221333/get-the-current-script-file-name
<?php
basename($_SERVER["SCRIPT_FILENAME"] )   // user.php
basename($_SERVER["SCRIPT_FILENAME"], '.php') // user ,  not user.php
?>

<li>
  <a class="menu <?php if (basename($_SERVER['PHP_SELF'] ) == 'sponsor.php') echo ' active_menu'; ?>"  href="sponsor.php">
    <i class="fa fa-user-secret"></i> <span>Sponsors</span> 
  </a>
</li>






CSS:
.active_menu{
  background-color:#222222;
}