tasoft/process

v1.0.1 2021-06-22 18:05 UTC

Requires

• php: >=7.2
• ext-pcntl: *
• ext-posix: *
• ext-sockets: *

Requires (Dev)

• phpunit/phpunit: ^6

MIT

• Thomas Abplanalp

README

This library controls process management using the PHP extension pcntl.

Installation

$ composer require tasoft/process

Simple Usage

<?php
use TASoft\Util\Process;

$process = new Process(function() {
    // Do stuff
});

// Now it will fork the process and call the callback function in separate process.
$process->run();

// Do other stuff in main process

// Wait until the child process has done
$process->wait();
// or kill the child process immediately.
$process->kill();

Problem

The main problem is that a forked process runs in an exact copy of the environment.
That means, on calling $process->run() the child process gets a copy of the current environment.

This raises two problems:

1. Everything you change (properties, $variables, etc) in the child process, remains there.
2. Everything you change in the parent process, remains there also.

Solution

I use the Pipe class. It creates a unix socket pair to communicate between the two processes.

Example With Pipe

<?php
use TASoft\Util\Process;

$process = new Process(function(Process $childProcess) {
    $result = NULL;
    
    // Do hard stuff
    
    // Please don't import the parent process!
    $childProcess->sendData( $result );
});

$process->run();

// Do other stuff

$data = $process->receiveData();
echo $data;

$process->wait(); // or kill

Don't import the parent process!

<?php
use TASoft\Util\Process;

$process = new Process(function() use (&$process) {
    $result = NULL;
    // Do stuff
    $process->sendData( $result );
    
    // This is wrong and will not work because $process IS A COPY OF THE MAIN PROCESS!
});

...