php中神奇的fastcgi_finish_request
听起来可能有些茫然,我们通过几个例子来说明一下:
复制代码 代码如下:
echo '例子:';
fastcgi_finish_request();
echo 'To be, or not to be, that is the question.';
file_put_contents('log.txt', '生存还是毁灭,这是个问题。');
?>
通过浏览器(不是命令行!)运行此脚本,结果发现并没有输出相应的字符串,但却生成了相应的文件。由此说明在调用fastcgi_finish_request后,客户端响应就已经结束,但与此同时服务端脚本却继续运行!
合理利用这个特性可以大大提升用户体验,趁热打铁再来一个例子:
复制代码 代码如下:
echo '例子:';
file_put_contents('log.txt', date('Y-m-d H:i:s') . " 上传视频\n", FILE_APPEND);
fastcgi_finish_request();
sleep(1);
file_put_contents('log.txt', date('Y-m-d H:i:s') . " 转换格式\n", FILE_APPEND);
sleep(1);
file_put_contents('log.txt', date('Y-m-d H:i:s') . " 提取图片\n", FILE_APPEND);
?>
代码里用sleep模拟一些耗时的操作,浏览时没有被堵塞,程序却都执行了,具体看日志。
末了给您提个醒,Yahoo在Best Practices for Speeding Up Your Web Site中提到了Flush the Buffer Early,也就是利用PHP中的flush方法把内容尽快发到客户端去,虽然表面上它和本文介绍的fastcgi_finish_request有些许的类似,但本质上完全不同,别混淆了。
转载附言: 我看了下这个方法, 在调用的时候, 会发送响应, 关闭连接. 但是不会结束PHP的运行. 相比调用flush, 或者我之前介绍的加速你的Echo来说, 这个方法能更加干脆一些.
另外, 从代码的可移植性讲的话, 可以在代码中附上如下代码:
复制代码 代码如下:
if (!function_exists("fastcgi_finish_request")) {
function fastcgi_finish_request() { }
}
不会造成代码部署在非fpm环境下造成问题.

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