Set active class menu of navigation dynamically in PHP

Set active class menu of navigation dynamically in PHP
<ul class="nav">
    <?php $page_name=b asename($_SERVER[ 'PHP_SELF']); ?>
    <!-- Main menu -->
    <li class="submenu <?php echo ($page_name=='welcome_note.php' || $page_name=='profile.php' || $page_name=='introduction.php' || $page_name=='location.php')?'current open':'';?>">
        <a href="#">
            <i class="glyphicon glyphicon-list"></i> Masters
            <span class="caret pull-right"></span>
        </a>
        <!-- Sub menu -->
        <ul>
            <li class="<?php echo ($page_name=='welcome_note.php')?'current':'';?>"><a href="welcome_note.php">Welcome Note</a>
            </li>
            <li class="<?php echo ($page_name=='profile.php')?'current':'';?>"><a href="profile.php">Corporate Profile</a>
            </li>
            <li class="<?php echo ($page_name=='introduction.php')?'current':'';?>"><a href="introduction.php">The Township</a>
            </li>
            <li class="<?php echo ($page_name=='location.php')?'current':'';?>"><a href="location.php">Location Map</a>
            </li>

        </ul>
    </li>
</ul>


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