xhprof nginx配置的预加载代码

<?php
//var_dump(function_exists("register_shutdown_function"));
//根据参数控制是否开启xhprof

if ((rand(1, 100) >= 1 || !empty($_GET['xhprof'])) && PHP_SAPI != 'cli' && function_exists('xhprof_enable')) { //(rand(1, 100) 控制采样率


    !defined('DEBUG_LIB') && define("DEBUG_LIB", "/data/www/xhprof/xhprof_lib"); //根据你存放的目录修改
    include_once DEBUG_LIB . "/utils/xhprof_lib.php";
    include_once DEBUG_LIB . "/utils/xhprof_runs.php";
    xhprof_enable(XHPROF_FLAGS_NO_BUILTINS + XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);

    register_shutdown_function(function() {
        //stop profiler
        if (!function_exists("xhprof_disable")) {
            return ;
        }
        $xhprof_data = xhprof_disable();
        $wt          = isset($xhprof_data['main()']['wt']) ? $xhprof_data['main()']['wt'] : 0;
        $client_id   = empty($_SERVER['HTTP_X_AKAM_CLIENTID']) ? '' : $_SERVER['HTTP_X_AKAM_CLIENTID'];
        if ($wt <= 2000000 && empty($_GET['xhprof'])) {
            return ;
        }
        //冲刷(flush)所有响应的数据给客户端
        $xhprof_runs = new XHProfRuns_Default();
        //save the run under a namespace "xhprof_foo"
        $uri = $_GET['xhprof'] . '-' . $client_id . '-wt:' . round($wt * 0.001) . '-' . $_SERVER['HTTP_HOST'] . $_SERVER['PATH_INFO'];
        $uri = str_replace(['/', '.', '\\', '|'], '_', $uri);
        $xhprof_runs->save_run($xhprof_data, $uri);
    });



}