php多进程几个例子

作者:袖梨 2022-06-24

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接受:
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 复制代码

//输出重定向到log文件
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');
//获取当前进程pid
$current_pid = getmypid();
$fork_nums = 10;
$total = 1000;

for($i = 0; $i $pid = pcntl_fork();
//等于0时,是子进程
if($pid == 0){
$current_pid = $pid;
do_task($i);
//大于0时,是父进程,并且pid是产生的子进程的PID
} else if($pid > 0) {
}
}

//任务函数
function do_task($task_num){
global $total;
$start = $total / 10 * $task_num;
$end = $total / 10 * ($task_num + 1);
for(;$start echo $task_num . " " . $start . "\n";
}
//子进程执行完任务以后终止,当然你可以返回主进程的代码部分做相关操作。
exit();
}

多进程控制的框架代码,留着备查

代码如下 复制代码

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 {
$pid = pcntl_fork();
if($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 复制代码

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 {
$urls_array[] = array("name" => "baidu", "url" => "http://www.ba***idu.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 复制代码
/**
* @title: PHP多线程类(Thread)
* @version: 1.0
* @author:
* @published: 2010-11-2
*
* PHP多线程应用示例:
* require_once 'thread.class.php';
* $thread = new thread();
* $thread->addthread('action_log','a');
* $thread->addthread('action_log','b');
* $thread->addthread('action_log','c');
* $thread->runthread();
*
* function action_log($info) {
* $log = 'log/' . microtime() . '.log';
* $txt = $info . "rnrn" . 'Set in ' . Date('h:i:s', time()) . (double)microtime() . "rn";
* $fp = fopen($log, 'w');
* fwrite($fp, $txt);
* fclose($fp);
* }
*/
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 {
$fp=fsockopen($_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 复制代码

$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。

linux系统中需要配置安装一下pthreads

1、扩展的编译安装(Linux),www.111com.net 编辑参数 --enable-maintainer-zts 是必选项:

代码如下 复制代码

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:

代码如下 复制代码
extension = "pthreads.so"

PHP扩展下载:https://*gi**thub.com/krakjoe/pthreads
PHP手册文档:http://*php*.net/*manual/zh/book.pthreads.php

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