php5如何实现多线程(多个函数异步执行)?
我有一个网站百度贴吧云抢二楼 code by 昌维,功能大概就是在百度贴吧里面抢二楼,现在这个网站有两百多个用户使用,我原本的执行流程在 【BUG】◇15-07-26◆〖水♀贴〗把cron的代码改了改终于正常回复_bug吧 这个帖子里面说的很清楚了。大搞就是设置每分钟执行一次cron.php,然后cron.php里面是一个用户执行一次,然后把config表里面的用户id增加1,下一轮cron就是从config表里面取出那个用户id,然后执行下一个用户,不断循环,这样做的后果就是总共两百多个用户,意味着差不多三个小时(两百多分钟)才能让所有用户抢一次二楼。
我现在想做到的就是能够一轮cron里面同时执行二十个用户的抢二楼功能,这样的话就要让二十个函数同时在cron.php里面执行,这样怎么做?php可以做到吗?之前听说过一个什么pthreads类,但是这个类官方文档看不懂啊,怎么办?
回复内容:
很显然你这个并发量,pcntl_fork(也就是多进程)是很适合的,多快好省,立马能用。crontab就算了吧,直接在多进程里面写死循环吧。当然,用gearman等等任务队列也可以,这样就很有逼格了。
当然,对这种IO密集型,你也可以用generator,作为一个PHP程序员,你的逼格已经爆表了。 你说的案例不是php本身的多线程能力啊,只是系统的cron在自己的框架内在不同时间点的调用cron.php这个文件而已。 可以多线程的,就是 pcntl_fork() 函数。
我以前用这个做了个抢沙发程序,满流弊的。 就是用pthreads扩展实现多线程,很简单的
这是我以前写的一篇简单使用该扩展的博文:
http://blog.xyao.org/php/497.html
不过现在新版pthreads2.0重构之后只支持php7了,要下1.0版 PHP写这样的东西并不合适,有点为难PHP了,你可以试试 Swoole扩展,Swoole: PHP的异步、并行、分布式扩展 好像可以异步执行,我没有用过。
推荐用go来写,go的routine非常适合做这种多任务并发抓取工作,同时200个用户并发去抢也轻轻松松,go会自动调度goroutine的运行。 你想多了 php并不支持多线程,但有个pcntl扩展,可以进行多进程控制。你的需求可以使用这个扩展实现,具体用法参考PHP手册。并不需要用到计划任务。 1、fork
2、gearman。并发利器。推荐用这个吧,多起几个worker nodejs or python

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