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Apache-2.0

SCF(腾讯云函数) PHP CGI 代理函数

https://cloud.tencent.com/product/scf

项目源起:

移动互联网时代,对于小型PHP项目来说,如何扛住瞬时高并发是一个尴尬的问题!

小型PHP项目普遍存在以下三个情况:

  1. “能力有限”——小团队小项目没有专业运维人员;
  2. “预算不足”——客户的服务器预算可能就是一年几千;
  3. “流量未知”——客户推广还是不推广,用户转发还是不转发,像薛定谔的猫一样;

在这三个条件的约束下,很少有方案可以同时满足“简单”、“廉价”、“按量付费”的要求。

我曾寄希望于新浪云的SAE,但是新浪云用“账户等级”设置门槛,SAE要实现扛瞬时高并发,至少得升级到年费1W的“经济型”帐号。

后来Serverless兴起,Serverless可以说特别符合要求。遗憾的是,Serverless中PHP是以常驻内存的CLI的模式执行,原本大量基于PHP CGI模式下的库、框架、WEB系统,都不能直接使用,必须进行改造适配。

另一方面,大部分PHP开发者习惯了无需管理内存的开发方式,在CLI模式下,PHP开发者需要控制好变量的使用及释放,一定程度上抬高了Serverless的使用门槛。

所幸,Laravel Vapor 提供了一个很好的解决思路,我们可以利用Serverless开启一个php-cgi服务,再将函数接收到的请求数据,转发给php-cgi去处理,拿到响应数据后再返回给浏览器。

最终结果就是,我们可以在Serverless继续以传统PHP WEB的方式来开发,无需做多余的适配。

使用说明:

将项目代码上传到腾讯云函数中,修改index.php文件中main_handler函数的两个变量值:$doc_root$script_name,用以指定PHP代码所在目录及默认执行文件。具体如下:

    // PHP代码目录
    // 可以是自动读取云函数当前的目录
    // $doc_root = dirname(__FILE__);
    // 也可以手动自行设定CFS文件挂载目录
    $doc_root = '/mnt';

    // 根据请求地址判断php执行文件名称,默认为index.php
    $script_name = 'index.php';

当云函数收到请求后,会根据请求路径去,分析$script_name文件名称,然后读取执行$doc_root目录下的$script_name文件,与普通php执行环境一致。

另外,可通过项目下的php.ini文件,控制php cgi的环境参数。php.ini文件内默认开启了redis扩展,为了节省内存其他扩展不开启,可自行删除注释符号开启扩展。

注意: 使用本项目前,请先了解云函数的概念及使用方式,具体可参考:

云函数 SCF

使用控制台创建函数

开发指南 > PHP

挂载 CFS 文件系统

其他参考

聊聊 Vapor

十分钟上线-函数计算玩转 WordPress

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