PHP多线程

#### 方案一:

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。
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

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

添加:
extension = "pthreads.so"

 <?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"; $t = microtime(true);
foreach ($urls_array as $key => $value)
{
$result_new[$key] = model_http_curl_get($value["url"]);
}
$e = microtime(true);
echo "For循环:".($e-$t)."\n";
?>

#### 方案二

以前使用curl的多线程并不是真正的多线程,只是一种模拟的多线程,现在使用pthreads来实现真正意义上的多线程。

下载:

  windows下:

    http://windows.php.net/downloads/pecl/releases/pthreads/0.0.45/

  mac、unix、linux下:

    https://github.com/krakjoe/pthreads

安装方式:

  windows下:

    解压得到pthreadVC2.dll和php_pthreads.dll文件,把vc2文件放到php.exe同级目录,把php_pthreads.dll放到扩展目录下。

    修改php.ini文件 添加extension=php_pthreads.dll

    修改Apache配置文件httpd.conf 添加LoadFile "yourpath/php/pthreadVC2.dll"

  mac、unix、linux下:

    具体可参考宴哥的博客http://blog.s135.com/pthreads/

调用方式:

  具体的用法也可以参考宴哥的博客http://blog.s135.com/pthreads/

  结合以前的get_html也可以这样来实现类

 class threads extends Thread
{
public $url = '';
public $options = array();
public $data; public function __construct($url, $options = array()){
$this->url = $url;
$this->options = $options;
} public function run(){
if(!empty($this->url)){
$this->data = $this->get_html($this->url, $this->options);
}
} public function get_html($url,$options = array()){
if(empty($options)){
$options[CURLOPT_RETURNTRANSFER] = true;
$options[CURLOPT_TIMEOUT] = 5;
}
$ch = curl_init($url);
curl_setopt_array($ch,$options);
$html = curl_exec($ch);
curl_close($ch);
if($html === false){
return false;
}
return $html;
}
}
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