Home > php教程 > php手册 > pthread实现多线程查询

pthread实现多线程查询

WBOY
Release: 2016-06-13 09:43:27
Original
900 people have browsed it

 

  导读:大多数网站的性能瓶颈不在PHP服务器上,因为它可以简单地通过横向增加服务器或CPU核数来轻松应对(对于各种云主机,增加VPS或CPU核数就更方便了,直接以备份镜像增加VPS,连操作系统、环境都不用安装配置),而是在于MySQL数据库。如果用 NoSQL 数据库,也许需要十次查询,才能处理完同样地业务逻辑。此时PHP多线程的作用非常明显,它可以同时执行NoSQL查询大大的提升效率。



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:

cd /Data/tgz/php-5.5.1
./configure --prefix=/Data/apps/php --with-config-file-path=/Data/apps/php/etc --with-mysql=/Data/apps/mysql --with-mysqli=/Data/apps/mysql/bin/mysql_config --with-iconv-dir --with-freetype-dir=/Data/apps/libs --with-jpeg-dir=/Data/apps/libs --with-png-dir=/Data/apps/libs --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-fpm --enable-mbstring --with-mcrypt=/Data/apps/libs --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --enable-opcache --with-pdo-mysql --enable-maintainer-zts
make clean
make
make install        

unzip pthreads-master.zip
cd pthreads-master
/Data/apps/php/bin/phpize
./configure --with-php-config=/Data/apps/php/bin/php-config
make
make install


 

vi /Data/apps/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:

  ===示例代码==============================================
url = $url;         }            public function run()         {             if(($url = $this->url))             {                 $this->data = model_http_curl_get($url);             }         }     }        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 "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";   ?>
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Recommendations
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template