Introduction to three ways of implementing PHP multithreaded simulation

When we are doing the project, some needs, especially the data response processing takes a lot of time, we all know that PHP itself does not support multi-threading, then how to implement the multi-threaded PHP?

1. PHP Multithreading under Linux

The following is the Pcntl_fork function that originates from PHP. Because this function relies on the implementation of the operating system fork, the things in this article only apply to Linux/unix. So let's take a look at the use of this function. This is what the PHP manual says:

<?php$pid = Pcntl_fork (), if ($pid = =-1) {die         (' could not fork '),} else if ($pid) {         ///We are the parent         pc Ntl_wait ($status); Protect against Zombie Children} else {         //We are the child}?>

Creating a subprocess through Pcntl_fork, if the return value is-1, indicates that the child process creation failed. The process ID that was created is returned to the parent process, and 0 is returned to the child process. It's hard to understand, so it should be written like this:

<?php$pid = Pcntl_fork (); if ($pid = =-1) {         //create failed I'll quit, there's nothing to say Die         (' could not fork ');} else{        if ($pid) {                //The code written from here is the parent process, because the system program is written, remember to give a return value exit                (0);        }        else{                ///From here to write the code is executed in the new process, the same normal exit, it is best to give a return value                exit (0);}        }? >

Such a change to understand more, if your parent process want to know that the child process gracefully exit, you can add the previous pcntl_wait.

2. By Stream_socket_client Way

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 ($v [' WA         ybill_id ']);        } else {$send _data[$k] [' body '] = array ($v [' order_id '] = = Array (' extra ' + 16));       } $data = Json_encode ($send _data[$k] [' body ']); $s = stream_socket_client ($host. ":", $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". $id. "Closes at". Date (' H:i:s ').             ".<br>";              Fclose ($R);           Unset ($sockets [$id]);           } else {$result [$id] = $data;        }}} else {/* A time-out means that *all* streams has failed to receive A response. */         echo "time-out!\n";       Break }} PRint_r ($result); }

3, through multi-process instead of multithreading

function Daemon ($func _name, $args, $number) {while   (true) {     $pid =pcntl_fork ();     if ($pid ==-1) {       echo "fork process fail";       Exit ();     } ElseIf ($pid) {//created child process         static $num =0;       $num + +;       if ($num >= $number) {         //when the number of processes reaches a certain number, the child process is recycled.         pcntl_wait ($status);           $num--;       }      } else{//For 0 is a child process created, then directly into the working state         if (function_exists ($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);

Summarize:

PHP can not use multi-threaded, in fact, we all know, but we can get him through a lot of ways to achieve, this is the introduction of the multi-threaded implementation of PHP method. Hope to help you!

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