多线程 - PHP怎么同时执行，或者说多个进程执行？
比如一个文件放着1万一个URL，然后有个PHp文件要读取这一万个URL，然后读URL把有邮箱全取出来，
那么问题就来了，一个文件处理这么多的话肯定慢死了，一个一个遍历一个一个读。
我意思是能不能读取到一个URL就开一个PHP进程单独处理，在读到一个在开一个PHP进程，这是我的思路，大神有好的办法吗？
回复内容：
比如一个文件放着1万一个URL，然后有个PHp文件要读取这一万个URL，然后读URL把有邮箱全取出来，
那么问题就来了，一个文件处理这么多的话肯定慢死了，一个一个遍历一个一个读。
我意思是能不能读取到一个URL就开一个PHP进程单独处理，在读到一个在开一个PHP进程，这是我的思路，大神有好的办法吗？
并行发起多个URL请求,可以考虑通过curl_multi和pthreads来实现:
http://php.net/manual/zh/function.curl-multi-init.php
https://github.com/krakjoe/pthreads/blob/master/examples/SimpleWebRequ...
PHP 5.3 以上版本，使用pthreads PHP扩展，可以使PHP真正地支持多线程。多线程在处理重复性的循环任务，能够大大缩短程序执行时间。
参考下这里http://zyan.cc/pthreads/
开1w个进程操作进程在进程切换的时候会有很大的开销，性能不一定能达到预期，甚至操作系统崩溃也是有可能的，我理解你这个程序是不是爬虫之类的脚本，不是线上的服务？如果只是这种线下任务的话，其实有简单的方法，比如你可以用split命令将1w个url分成100个，然后用shell写个循环，开100个进程去执行
用计划任务吧，php xxx.php 每次处理10-20条，
然后用shell脚本，每秒处理一次
这样子的话，系统压力应该不大。又能够快速处理
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