How to enable pcntl module and implement multi-process programming in PHP?

First check the PHP version I installed:

PHP 7.3.7 (cli) (built: Jul 12 2019 22:25:55) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.3.7, Copyright (c) 1998-2018 Zend Technologies

php needs to install the pcntl module to implement multi-process. This module is officially provided by php, so we can use it in PHP Found in the source code, download the php7.3.7 source code and extract it to the /home directory. At this time, the extension pcntl we need is at/home/php-7.3.7/ext/pcntl

Execute the following commands in sequence:

phpize ./configure --with-php-config=/usr/local/bin/php-config make & make install

To determine the path of thephp-configfile, you can usefind / -name php-configand finally generatepcntl.sofile.

Then find the path where the ini file of php is located and use thephp --inicommand to view

As for the path of the php extension module, you can usephp -i | grep extension_dirCheck, then copy the generated so file to the module path and addextension=pcntlto the php.ini file

Use php -m to check whether the module is loaded ! At this point, the pcntl module is installed. Let’s start coding.

for ($i = 0; $i < 3; $i++){ $pid = pcntl_fork(); if ($pid == -1) { die("开启进程失败"); } elseif ($pid) { echo "启动子进程 $pid \n"; } else { echo "子进程 ".getmypid()." 正在处理任务\n"; sleep(rand(5,10)); exit; } } while (pcntl_waitpid(0, $status) != -1) { $status = pcntl_wexitstatus($status); echo "子进程推出，状态码 $status \n"; }

pcntl_fork()The function creates a child process. When successful, the PID of the generated child process is returned in the execution thread of the parent process. , returns 0 in the child process execution thread. On failure, -1 is returned in the parent process context, the child process is not created, and a PHP error is raised.

pcntl_waitpid()— Wait for or return the child process status of fork, suspend the execution of the current process until the process with the process number specified by the parameter pid exits, or a signal is received to interrupt the current process. Process or call a signal handling function. The returned value can be -1, 0 or >0. If it is -1, it means that the child process has an error. If >0, it means that the child process has exited and the value is the pid of the exiting child process. As for how to exit, you can pass $status status code response

root@4226aaf8d937:/home/demo# php index.php 启动子进程 150 启动子进程 151 启动子进程 152 子进程 152 正在处理任务 子进程 151 正在处理任务 子进程 150 正在处理任务 子进程推出，状态码 0 子进程推出，状态码 0 子进程推出，状态码 0

root@4226aaf8d937:/# ps -aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.3 3976 3180 pts/0 Ss 04:42 0:00 bash root 17 0.0 0.3 3868 3184 pts/1 Ss 04:48 0:00 bash root 149 0.3 2.1 79740 21888 pts/0 S+ 06:18 0:00 php index.php root 150 0.0 0.6 79740 6664 pts/0 S+ 06:18 0:00 php index.php root 151 0.0 0.6 79740 6604 pts/0 S+ 06:18 0:00 php index.php root 152 0.0 0.6 79740 6604 pts/0 S+ 06:18 0:00 php index.php root 153 0.0 0.2 7640 2660 pts/1 R+ 06:18 0:00 ps -aux

How to deal with when the child process is forcibly killed using kill -9 process id?

        

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pcntl_wifexited— Check whether the status code represents a normal exit

pcntl_wifsignaled— Check whether the child process status code represents a normal exit Interrupted by a signal

pcntl_wtermsig—Returns the signal that caused the child process to be interrupted

We open one of the two windows:

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