XHProf header/footer

footer.php

<?php
if (extension_loaded('xhprof')) {
    $xhprofDomain = 'http://xhprof.com'; // xhprof GUI domain
    $profilerNamespace = 'myapp';  // namespace for your application
    $xhprofData = xhprof_disable();
    $xhprofRuns = new \XHProfRuns_Default();
    $runId = $xhprofRuns->save_run($xhprofData, $profilerNamespace);

    if (!$__xhIsAjax) {
        // url to the XHProf UI libraries (change the host name and path)
        echo '<!-- '. sprintf('%s/?run=%s&source=%s', $xhprofDomain, $runId, $profilerNamespace) . ' -->';
    }
}

header.php

<?php
if (extension_loaded('xhprof')) {
    include_once "xhprof_lib/utils/xhprof_lib.php";
    include_once "xhprof_lib/utils/xhprof_runs.php";
    xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
    $__xhIsAjax = (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && ('xmlhttprequest' == strtolower($_SERVER['HTTP_X_REQUESTED_WITH'])));
}