Inside your header.php
function header($title)
{
echo '<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>.$title.</title>
</head>';
}
then you include your head.php
< ?php include("head.php"); ?>
and finally, instead the < head >< /head > tags in your main file your call the function to create the title.
<?php header('This is my Awesome Page'); ?>
Or still
<?php
$pageTitle = "My Title";
header($pageTitle);
?>
This should work for you.