Should i mix html code and php code like this:
<?php
session_start();
session_destroy();
include_once( "../../system/system.config.php" );
echo $DOCTYPE;
?>
<html>
<head>
<title><?php echo $PAGE_TITLE ?></title>
<script type= "text/javascript" src= "../../js/error.js"></script>
</head>
<body>
</body>
<html>
or should i have it all in php and use echo '<html>' ......does it matter?