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Polyfill Implementation of Threads in PHP. This class supports both FORK process and native Threads using ZTS compilation;

This class detects automatically if PHP was compiled:

  • with ZTS (–enable-maintainer-zts or –enable-zts) and the extension pthreads (works on Windows also)
  • with the Process Controle (–enable-pcntl)

and choose the most suitable handler for processing the threads. The thread interface is the same whatever is the Thread handler.

Some Informations

  • Most of the fork implementation was based on the post “” by the “superuser”
  • Tales Santos (tsantos84) contributed on the base of the Thread ZTS by creating the code base and solving some specific thread problems. Thanks!!!!


Assume for the examples below the class ‘Foo’ and the method ‘bar’:


// Method to be executed in a thread
class Foo
    public function bar($t)
        echo "Starint thread #$t" . PHP_EOL;;
        sleep(1 * rand(1, 5));
        for ($i = 0; $i < 10; $i++)
            echo "Hello from thread #$t, i=$i" . PHP_EOL;
        echo "Ending thread #$t" . PHP_EOL;
        return $t;

Basic Thread Usage

// Create a basic instance:
$foo = new Foo();

// Create the Threads passing a callable
$thread1 = new ByJG\PHPThread\Thread( [$foo, 'bar'] );
$thread2 = new ByJG\PHPThread\Thread( [$foo, 'bar'] );

// Start the threads and passing parameters

// Wait the threads to finish

// Get the thread result
echo "Thread Result 1: " . $thread1->getResult();
echo "Thread Result 2: " . $thread2->getResult();

Thread Pool Usage

You can create a pool of threads.

// Create a basic instance:
$foo = new Foo();

// Create a instance of the ThreadPool
$threadPool = new \ByJG\PHPThread\ThreadPool();

// Create and queue the threads with call parameters
$threadPool->queueWorker( [ $foo, 'bar' ] , [ 1 ]);
$threadPool->queueWorker( [ $foo, 'bar' ], [ 2 ]);

// Starts all the threads in the queue

// Wait until there is no more active workers

// Get the return value from the thread.
foreach ($threadPool->getThreads() as $thid) {
    echo 'Result: ' . $threadPool->getThreadResult($thid) . "\n";

echo "\n\nEnded!\n";

Important Note for the FORK implementation

In order to get working the ‘getResult’ of the fork implementation is necessary pass the setup parameters to the Thread::setThreadHandlerArguments() method;


$thread = new \ByJG\PHPThread\Thread([$someinstance, $somemethod]);
        'max-size' => 0x100000,
        'default-permission' => '0700'


Just type: composer require "byjg/phpthread=2.1.*"

Major changes from 1.* to 2.*

  • Method Thread::start() renamed to Thread::execute()
  • Implemented PThread and Fork as a Polyfill class


How do I instantiate a method class?

$thr = new ByJG\PHPThread\Thread(array('classname', 'methodname'));


$instance = new myClass();
$thr = new ByJG\PHPThread\Thread(array($instance, 'methodname'));