php多進程的實現依賴於pcntl擴充，編譯PHP的時候，可以加上’–enable-pcntl’或者也可以單獨編譯。
有三點需要注意：
1.子進程不在執行fork之前的代碼，只是把父進程的記憶體狀況複製一份新的，所以，關於子進程的個人化需要單獨設定。
2.輸出重新導向，程式中使用echo，或造成命令列的混亂，影響分辨。可以用ob_start重新導向到log檔案，當然，你直接使用log是更好的辦法。此執行個體中log檔案，按照進程pid分組。
3.父進程沒有代碼執行，將可能提前退出，子進程可能成為孤兒進程。
demo接受：
用10個子進程來處理輸出任務，任務總量是1000,然後，按照任務數平均分到十個子進程當中去。
| 代碼如下 |
複製代碼 |
<?php
//輸出重新導向到log檔案
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');
//擷取當前進程pid
$current_pid = getmypid();
$fork_nums = 10;
$total = 1000;
for($i = 0; $i < $fork_nums; $i++){
$pid = pcntl_fork();
//等於0時，是子進程
if($pid == 0){
$current_pid = $pid;
do_task($i);
//大於0時，是父進程，並且pid是產生的子進程的PID
} else if($pid > 0) {
}
}
//任務函數
function do_task($task_num){
global $total;
$start = $total / 10 * $task_num;
$end = $total / 10 * ($task_num + 1);
for(;$start<$end;$start++){
echo $task_num . " " . $start . "＼n";
}
//子進程執行完任務以後終止，當然你可以返回主進程的代碼部分做相關操作。
exit();
} |
多進程式控制制的架構代碼，留著備查
| 代碼如下 |
複製代碼 |
declare(ticks=1);
function sigHandler($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
給出一段PHP多線程、與For迴圈，抓取百度搜尋網頁面的PHP程式碼範例：
| 代碼如下 |
複製代碼 |
<?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);
$e = microtime(true);
echo "多線程：".($e-$t)."＼n"; $t = microtime(true);
foreach ($urls_array as $key => $value)
{
$result_new[$key] = model_http_curl_get($value["url"]);
}
$e = microtime(true);
echo "For迴圈：".($e-$t)."＼n";
?> |
PHP多線程類）
| 代碼如下 |
複製代碼 |
/**
* @title: PHP多線程類(Thread)
* @version: 1.0
* @author: < web@ >
* @published: 2010-11-2
*
* PHP多線程應用樣本：
* 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 < $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：
| 代碼如下 |
複製代碼 |
$thread = new thread();
$thread->addthread('func1','info1');
$thread->addthread('func2','info2');
$thread->addthread('func3','info3');
$thread->runthread(); |
說明：
addthread是添加線程函數，第一個參數是函數名，之後的參數（可選）為傳遞給指定函數的參數。
runthread是執行線程的函數。
在linux系統中需要配置安裝一下pthreads
1、擴充的編譯安裝(Linux），www.111cn.net 編輯參數 --enable-maintainer-zts 是必選項：
| 代碼如下 |
複製代碼 |
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：
| 代碼如下 |
複製代碼 |
| extension = "pthreads.so" |
PHP擴充下載：https://github.com/krakjoe/pthreads
PHP手冊文檔：http://php.net/manual/zh/book.pthreads.php
