This project reproduces the issue when using static members in PHP threads. For some reason, the static members of a class is not accessible when accessed in thread context (e.g: \Thread::run() method).

require 'MyClass.php';
require 'MyThread.php';

var_dump(MyClass::$data); // prints the array properly

$thread = new MyThread();

$thread->start() && $thread->join();

array(2) {
  ["foo"]=>
  string(3) "bar"
  ["bar"]=>
  string(3) "baz"
}
array(2) {
  ["foo"]=>
  string(3) "bar"
  ["bar"]=>
  string(3) "baz"
}

array(2) {
  ["foo"]=>
  string(3) "bar"
  ["bar"]=>
  string(3) "baz"
}
NULL

Run the below code to create an image with PHP 5.6 with pthreads enabled.

$ docker build --rm -t pthreads:php56 .

Run the below code to create an image with PHP 7 with pthreads enabled.

$ docker build --rm -f Dockerfile.php7 -t pthreads:php7 .

$ ./php56 sample.php

$ ./php7 sample.php

• GitHub - As the issues was found using the composer autoloader inside the thread
• PHP Bugs