根据某些条件在菜单中提供链接

Question

I have a situation here. In my project the menu section contains some anchor tags, it will work perfectly when we in index page, but moving to other pages i want to give the real links there, so my question is how to check which page is viewing or how to check the the site viewer is not in index page

<li><a href="#home" class="active">Home</a></li>
<li><a href="#about_us">About Us</a></li>

I want to change href conditionally, for example when I'm in index the above href attribute is OK, and when I'm in another page, for example register, then the href attribute change to index.php/site/index#home

Thanks in advance

UPDATE : thank you uttara,I found a solution with the help of her

<?php
$url = $_SERVER["REQUEST_URI"];
$page = pathinfo($url);
$filename = $page['filename'];
$href = ($filename=='root_directory' || $filename=='index'  || $filename=='site')?'':Yii::app()->request->baseUrl;
?>
<a href="<?php echo $href ; ?>#home" class="active">Home</a>

Answer 1

$url = $_SERVER["REQUEST_URI"];
$page = pathinfo($url);
$filename = $page['filename'];

$filename will give you the name of current page being viewed

and you can check for

if($filename != 'index')
{
    echo '<li><a href="index.php/site/index#home" class="active">Home</a></li>
          <li><a href="#about_us">About Us</a></li>';
}
else
{
    echo '<li><a href="#home" class="active">Home</a></li>
              <li><a href="#about_us">About Us</a></li>';
}

remember $filename gives you just the filename without extension