XHProf

.htaccess

php_value auto_prepend_file header.php
php_value auto_append_file footer.php

footer.php

<?php

if (extension_loaded('xhprof')) {
	if(isset($_REQUEST['xhprof'])) {
		$name = $_SERVER['SCRIPT_NAME'];
		$name = explode("/", trim($name, "/"));
		
		$profiler_namespace = array_shift($name);  // namespace for your application
		$xhprof_data = xhprof_disable();
		$xhprof_runs = new XHProfRuns_Default();
		$run_id = $xhprof_runs->save_run($xhprof_data, $profiler_namespace);
 
		// url to the XHProf UI libraries (change the host name and path)
		$profiler_url = sprintf('http://xhprof/index.php?run=%s&source=%s', $run_id, $profiler_namespace);
    		echo '<a href="'. $profiler_url .'" target="_blank">Profiler output</a>';
	}
}

header.php

<?php

if (extension_loaded('xhprof')) {
	if(isset($_REQUEST['xhprof'])) {
		include_once '/opt/local/www/php5-xhprof/xhprof_lib/utils/xhprof_lib.php';
		include_once '/opt/local/www/php5-xhprof/xhprof_lib/utils/xhprof_runs.php';
		xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
	}
}