PJAX not working when requesting PHP file - php

Question

I'm trying to write a site with content loaded into a div at runtime using PJAX. The PHP files that i request with the PJAX all include a header and footer, which only produce content if isset($_SERVER['X-PJAX'])
However, when i use the PJAX to load the PHP file, the entire page refreshes. I would assume it's something wrong with my PJAX code, but loading a plain HTML file works fine.
EDIT: In case it is of help, i'm currently running all this on WAMP Server 2.2 running on localhost. It's what i do all my dev stuff in.
for reference, here's the JS i'm using to load the content, and an example of a php page
JS:
if ( $.support.pjax ) {
//disable <a> tabs, store value of href so pjax can use it
$('header a').each(function () {
$(this)
.attr('pjax', $(this).attr('href'))
.removeAttr('href')
.css('cursor','pointer')
})
//link up the pjax
.live('click', function () {
var link = $(this)
$('#content').animate({opacity:0}, {duration:500, complete:function(){
$.pjax({
url: link.attr('pjax'),
container: '#content',
complete: function() {
$('#content').animate({opacity:1}, 500);
}
});
}});
});
}
PHP:
//header.php
<?php
//If we are loading with pjax, ignore the header
if (!isset($_SERVER['X-PJAX'])) {
?>
<!-- head section, opening body tags, etc -->
<div role="main" id="content">
<?php } ?>
//foo.php
<?php include 'header.php'; ?>
<p>sample content</p>
<?php include 'footer.php'; ?>
//footer.php
<?php
if (!isset($_SERVER['X-PJAX'])) {
?>
</div>
<!-- load scripts, etc-->
<?php } ?>

Answer 1

i always have more luck with just using
$_SERVER["HTTP_X_PJAX"]
Here is the github repo i made of a fully functional PJAX php example, for those that need all the source code to look at to get up and running, and may help anyone else out there searching for PJAX php inplementation
https://github.com/Jrizzi1/pjaxphp