Introduction to three methods of php multi-thread simulation implementation-PHP Tutorial-php.cn

When we were working on the project, we had some requirements, especially the response processing of data that took a lot of time. We all know that PHP itself does not support multi-threading, so how should we implement multi-threading in PHP?

1. PHP multi-threading under Linux

The following things are derived from the pcntl_fork function of PHP. Because of this The function depends on the implementation of the operating system fork, so the things described in this article only apply to Linux/Unix. So let’s take a look at the usage of this function first.php manualsays this:

Copy after login

Create a child process through pcntl_fork, if the return value If it is -1, then it means that the creation of the child process failed. The successfully created process ID will be returned to the parent process, and 0 will be returned to the child process. It is difficult to understand, so it should be written like this:

Copy after login

It will be better to change it this way I understand better. If your parent process wants to know that the child process exits normally, you can add the previous pcntl_wait.

2. Through stream_socket_client method

function sendStream() { $english_format_number = number_format($number, 4, '.', ''); echo $english_format_number; exit(); $timeout = 10; $result = array(); $sockets = array(); $convenient_read_block = 8192; $host = "test.local.com"; $sql = "select waybill_id,order_id from xm_waybill where status>40 order by update_time desc limit 1 "; $data = Yii::app()->db->createCommand($sql)->queryAll(); $id = 0; foreach ($data as $k => $v) { if ($k % 2 == 0) { $send_data[$k]['body'] = NoticeOrder::getSendData($v['waybill_id']); } else { $send_data[$k]['body'] = array($v['order_id'] => array('extra' => 16)); } $data = json_encode($send_data[$k]['body']); $s = stream_socket_client($host . ":80", $errno, $errstr, $timeout, STREAM_CLIENT_ASYNC_CONNECT | STREAM_CLIENT_CONNECT); if ($s) { $sockets[$id++] = $s; $http_message = "GET /php/test.php?data=" . $data . " HTTP/1.0\r\nHost:" . $host . "\r\n\r\n"; fwrite($s, $http_message); } else { echo "Stream " . $id . " failed to open correctly."; } } while (count($sockets)) { $read = $sockets; stream_select($read, $w = null, $e = null, $timeout); if (count($read)) { /* stream_select generally shuffles $read, so we need to compute from which socket(s) we're reading. */ foreach ($read as $r) { $id = array_search($r, $sockets); $data = fread($r, $convenient_read_block); if (strlen($data) == 0) { echo "Stream " . $id . " closes at " . date('h:i:s') . ".
 "; fclose($r); unset($sockets[$id]); } else { $result[$id] = $data; } } } else { /* A time-out means that *all* streams have failed to receive a response. */ echo "Time-out!\n"; break; } } print_r($result); }

Copy after login

3. Through multi-process instead of multi-thread

function daemon($func_name,$args,$number){ while(true){ $pid=pcntl_fork(); if($pid==-1){ echo "fork process fail"; exit(); }elseif($pid){//创建的子进程 static $num=0; $num++; if($num>=$number){ //当进程数量达到一定数量时候，就对子进程进行回收。 pcntl_wait($status); $num--; } }else{ //为0 则代表是子进程创建的，则直接进入工作状态 if(function_exists($func_name)){ while (true) { $ppid=posix_getpid(); var_dump($ppid); call_user_func_array($func_name,$args); sleep(2); } }else{ echo "function is not exists"; } exit(); } } } function worker($args){ //do something } daemon('worker',array(1),2);

Copy after login

Summary:

Multi-threading cannot be used in php. In fact, we all know it. But we can achieve it through many methods. This article introduces the multi-threading implementation method in PHP. Hope this helps!

Related recommendations:

php multi-threading implementation example

php multi-threading method - shell

PHP multi-threading small case

About PHP multi-threading processing issues

The above is the detailed content of Introduction to three methods of php multi-thread simulation implementation. For more information, please follow other related articles on the PHP Chinese website!