PHP多线程之pthreads详解

WBOY
Release: 2016-06-20 13:03:23
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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。PHP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。

我之前的文章中说过,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 MySQL 数据库,一条联合查询的SQL,也许就可以处理完业务逻辑,但是,遇到大量并发请求,就歇菜了。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,但每次查询都比 MySQL 要快,十次循环NoSQL查询也许比一次MySQL联合查询更快,应对几万次/秒的查询完全没问题。如果加上PHP多线程,通过十个线程同时查询NoSQL,返回结果汇总输出,速度就要更快了。我们实际的APP产品中,调用一个通过用户喜好实时推荐商品的PHP接口,PHP需要对BigSea NoSQL数据库发起500~1000次查询,来实时算出用户的个性喜好商品数据,PHP多线程的作用非常明显。

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
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vi /Data/apps/php/etc/php.ini
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extension = "pthreads.so"
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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);
  }
  }
  }
  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 : &#39;Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)&#39;;
  $curl = curl_init();
  curl_setopt($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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