PHP if($_SERVER["REQUEST_URI"] == '/') [closed]

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I am trying to display a banner on the front page of my shopping cart, but not the rest of the pages on my site. I am using the code below, but it doesn't seem to be working correctly.

<?php 
    if ($_SERVER['REQUEST_URI'] == "/") 
    { 
        print '<img src=\"images/banner_2.jpg\">; 
    } 
?>

---

This should work everywhere:

if (!isset($_SERVER['REQUEST_URI']) || ltrim($_SERVER['REQUEST_URI'],'/') === '') {
  print '<img src="images/banner_2.jpg">';
}

Only issue is that if for whatever reason the HTTP server does not provide $_SERVER['REQUEST_URI'], you will end up with a banner on every page.