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java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了哦。
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。
<?php
//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 < $fork_nums; $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 < $end; $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 < 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：代码如下复制代码
<?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";
?>PHP多线程类）
<?php
/**
* @title: PHP多线程类(Thread)
* @version: 1.0
* @author: < web@ >
* @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() . "\r\n";
* $fp = fopen($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 < $size; $i++) {
$fp = fsockopen($_SERVER['HTTP_HOST'], $_SERVER['SERVER_PORT']);
if ($fp) {
$out = "GET {$_SERVER['PHP_SELF']}?flag=$i HTTP/1.1\r\n";
$out.= "Host: {$_SERVER['HTTP_HOST']}\r\n";
$out.= "Connection: Closernrn";
fputs($fp, $out);
fclose($fp);
}
}
}
}
}
?>使用方法：
<?php
$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），php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扩展下载：https://github.com/krakjoe/pthreads
PHP手册文档：http://php.net/manual/zh/book.pthreads.php
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