php - How to set page title in single page site -

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hi have single page ajax website single page loading pages set page title depending on current view.

i have tried using 

<title><!--title--></title>     <? $pagecontents = ob_get_contents (); // page's html string ob_end_clean (); // wipe buffer  // replace <!--title--> $pagetitle variable contents, , print html echo str_replace ('<!--title-->', $pagetitle, $pagecontents); ?>

i have added titles page links 

  <li class="menu-link">         <a href="index.php?page=home"><img src="images/menu/home.png" width="72" height="72" alt="home" />home</a>         <?php $pagetitle = 'saunders-solutions freelance design , development'; ?>     </li>     <li class="menu-link">         <a href="index.php?page=about"><img src="images/menu/about.png" width="72" height="72" alt="about" />about</a>         <?php $pagetitle = 'about saunders-solutions freelance design , development';  ?>     </li>

however shows same title pages appreciated

in javascript:

document.title = "new title";

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