php多进程几个例子
php多进程这个东西先是在java中有不过现在高版本的php也支持多进程这个功能,但经过测试性能不如j(www.phpfensi.com)ava了希望后期有所提高了,下面我们一起来看看我整理了几个关于php多进程例子,希望能帮助你理解多线程.
php多进程的实现依赖于pcntl扩展,编译PHP的时候,可以加上’–enable-pcntl’或者也可以单独编译.
有三点需要注意:
1.子进程不在执行fork之前的代码,只是把父进程的内存状况复制一份新的,所以,关于子进程的个性化设置需要单独设置.
2.输出重定向,程序中使用echo,或造成命令行的混乱,影响分辨,可以用ob_start重定向到log文件,当然,你直接使用log是更好的办法,此实例中log文件,按照进程pid分组.
3.父进程没有代码执行,将可能提前退出,子进程可能成为孤儿进程.
demo接收:
用10个子进程来处理输出任务,任务总量是1000,然后,按照任务数平均分到十个子进程当中去,代码如下:
-
- function echo_to_log($content){
- global $current_pid;
- $logfile = __FILE__ . $current_pid . '.log';
- $fp = fopen($logfile, 'a+');
- fwrite($fp, $content);
- fclose($fp);
- }
-
- ob_start('echo_to_log');
-
- $current_pid = getmypid();
- $fork_nums = 10;
- $total = 1000;
-
- for($i = 0; $i < $fork_nums; $i++){
- $pid = pcntl_fork();
-
- if($pid == 0){
- $current_pid = $pid;
- do_task($i);
-
- } else if($pid > 0) {
- }
- }
-
-
- function do_task($task_num){
- global $total;
- $start = $total / 10 * $task_num;
- $end = $total / 10 * ($task_num + 1);
- for(;$start<$end;$start++){
- echo $task_num . " " . $start . "\n";
- }
-
- exit();
- }
多进程控制的框架代码,留着备查,代码如下:
- declare(ticks=1);
- function sigHandler($signal)
- {
- echo "a child exited\n";
- }
- pcntl_signal(SIGCHLD, sigHandler, false);
- echo "this is " . posix_getpid() . PHP_EOL;
- for($i=0; $i<3; $i++)
- {
- $pid = pcntl_fork();
- if($pid == -1)
- {
- echo 'fork failed ' . PHP_EOL;
- }
- else if($pid)
- {
- }
- else
- {
- $pid = posix_getpid();
- echo 'child ' . $pid . ' ' . time() . PHP_EOL;
- sleep(rand(2,5));
- echo 'child ' . $pid . ' done ' . time() . PHP_EOL;
- exit(0);
- }
- }
- do
- {
- $pid = pcntl_wait($status);
- echo 'child quit ' . $pid . PHP_EOL;
- }while($pid > 0);
- echo 'parent done' . PHP_EOL;
例子,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,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, (www.phpfensi.com)$userAgent);
- $result = curl_exec($curl);
- curl_close($curl);
- return $result;
- }
-
- for ($i=0; $i < 100; $i++)
- {
- $urls_array[] = array("name" => "baidu", "url" => "http://www.phpfensi.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";
- ?>
PHP多线程类,代码如下:
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- class thread {
-
- var $hooks = array();
- var $args = array();
-
- function thread() {
- }
-
- function addthread($func)
- {
- $args = array_slice(func_get_args(), 1);
- $this->hooks[] = $func;
- $this->args[] = $args;
- return true;
- }
-
- function runthread()
- {
- if(isset($_GET['flag']))
- {
- $flag = intval($_GET['flag']);
- }
- if($flag || $flag === 0)
- {
- call_user_func_array($this->hooks[$flag], $this->args[$flag]);
- }
- else
- {
- for($i = 0, $size = count($this->hooks); $i < $size; $i++)
- {
- $fp=fsockopen($_SERVER['HTTP_HOST'],$_SERVER['SERVER_PORT']);
- if($fp)
- {
- $out = "GET {$_SERVER['PHP_SELF']}?flag=$i HTTP/1.1rn";
- $out .= "Host: {$_SERVER['HTTP_HOST']}rn";
- $out .= "Connection: Closernrn";
- fputs($fp,$out);
- fclose($fp);
- }
- }
- }
- }
- }
使用方法,代码如下:
- $thread = new thread();
- $thread->addthread('func1','info1');
- $thread->addthread('func2','info2');
- $thread->addthread('func3','info3');
- $thread->runthread();
说明:addthread是添加线程函数,第一个参数是函数名,之后的参数(可选)为传递给指定函数的参数.
runthread是执行线程的函数.
在linux系统中需要配置安装一下pthreads
1、扩展的编译安装(Linux),www.phpfensi.com 编辑参数 --enable-maintainer-zts 是必选项,代码如下:
- 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
添加如下代码:
extension = "pthreads.so"
PHP扩展下载:https://github.com/krakjoe/pthreads
PHP手册文档:http://php.net/manual/zh/book.pthreads.php