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。
php扩展下载：https://github.com/krakjoe/pthreads
php手册文档：http://php.net/manual/zh/book.pthreads.php
1、扩展的编译安装(linux），编辑参数 –enable-maintainer-zts 是必选项：
'./configure' '--prefix=/usr/local/webserver/php' '--with-config-file-path=/usr/local/webserver/php/etc' '--with-apxs2=/usr/local/webserver/httpd/bin/apxs' '--with-libxml-dir=/usr/local/webserver/libxml2' '--with-mysql=/usr/local/webserver/mysql' '--with-mysqli=/usr/local/webserver/mysql/bin/mysql_config' '--enable-soap' '--enable-sockets' '--with-curl' --enable-maintainer-ztsmake clean make make install unzip pthreads-master.zip cd pthreads-master /usr/local/webserver/php/bin/phpize ./configure --with-php-config=/usr/local/webserver/php/bin/php-config
makemake install
vi /usr/local/webserver/php/etc/php.ini
添加
extension = "pthreads.so"
2、给出一段php多线程、与for循环，抓取百度搜索页面的php代码示例：
<?php class test_thread_run extends thread{ public $url; public $data; public function __construct($url) { $this->url = $url; } public function run() { if(($url = $this->url)) { $this->data = model_http_curl_get($url); } } }
<?php function model_thread_result_get($urls_array){ foreach ($urls_array as $key => $value) { $thread_array[$key] = new test_thread_run($value["url"]); $thread_array[$key]->start(); } foreach ($thread_array as $thread_array_key => $thread_array_value) { while($thread_array[$thread_array_key]->isrunning()) { usleep(10); } if($thread_array[$thread_array_key]->join()) { $variable_data[$thread_array_key] = $thread_array[$thread_array_key]->data; } } return $variable_data; } function model_http_curl_get($url,$useragent="") { $useragent = $useragent ? $useragent : 'mozilla/4.0 (compatible; msie 7.0; windows nt 5.2)'; $curl = curl_init(); curl_setopt($curl, curlopt_url, $url); curl_setopt($curl, curlopt_returntransfer, 1); curl_setopt($curl, curlopt_timeout, 5); curl_setopt($curl, curlopt_useragent, $useragent); $result = curl_exec($curl); curl_close($curl); return $result; } for ($i=0; $i < 100; $i++) { $urls_array[] = array("name" => "baidu", "url" => "http://www.baidu.com/s?wd=".mt_rand(10000,20000)); } $t = microtime(true); $result = model_thread_result_get($urls_array); $e = microtime(true); echo "多线程：".($e-$t)."\n"; $t = microtime(true); foreach ($urls_array as $key => $value) { $result_new[$key] = model_http_curl_get($value["url"]); } $e = microtime(true); echo "for循环：".($e-$t)."\n"; ?>
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以上就是php扩展之多线程的详细内容。