php多线程抓取信息测试例子

发布:smiling　来源: PHP粉丝网　添加日期：2014-08-27 10:15:31　浏览: 评论：0　

只在php5.3以后的版本才真正的可以使用多线程序了,以前都是假的curl实现的多线程工作,下面我来给各位介绍几个多线程抓取信息测试例子,希望对各位会有帮助.

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-5.3.8

./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

添加扩展:

vi /Data/apps/php/etc/php.ini

extension = "pthreads.so"

一段PHP多线程、与For循环,抓取百度搜索页面的PHP代码示例,代码如下:

<?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 : '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";

//开源代码phpfensi.com

  $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";

?>

例子,采集数据,代码如下:

<?php

$urls = array(

'http://www.111cn.net/',

'http://www.sohu.com/',

'http://www.163.com/'

);

$save_to='/test.txt'; // 把抓取的代码写入该文件

$st = fopen($save_to,"a");

$mh = curl_multi_init();

foreach ($urls as $i => $url) {

$conn[$i] = curl_init($url);

curl_setopt($conn[$i], CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)");

curl_setopt($conn[$i], CURLOPT_HEADER ,0);

curl_setopt($conn[$i], CURLOPT_CONNECTTIMEOUT,60);

curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,true); // 设置不将爬取代码写到浏览器，而是转化为字符串

curl_multi_add_handle ($mh,$conn[$i]);

}

do {

curl_multi_exec($mh,$active);

} while ($active);

foreach ($urls as $i => $url) {

$data = curl_multi_getcontent($conn[$i]); // 获得爬取的代码字符串

fwrite($st,$data); // 将字符串写入文件。当然，也可以不写入文件，比如存入数据库

} // 获得数据变量，并写入文件

foreach ($urls as $i => $url) {

curl_multi_remove_handle($mh,$conn[$i]);

curl_close($conn[$i]);

}

curl_multi_close($mh);

fclose($st);

?>