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Php doesn't seem to recognize the $this variable

I wrote some code and it has some weird behavior. It throws fatal errors for all the private and protected variables I have declared, even if I use them with $this in front of them. It seems like the scope of the $this variable is not recognized.

I use php version 7.1.0 and apache version 2.4.23 (and I installed the mpm worker), Netbeans, Ubuntu 16.04. I also use pThreads (https://pecl.php.net/package/pthreads). I searched on the internet and didn't found anything similar to this problems.

The Pool class from which my class extends is a class of pThreads. e.g.

class interfacePool extends Pool {

public $data = array();
private $workerCount;
private $timeoutStart; 
private $timeout = 50; 

public function process() {

    $this->timeoutStart = microtime(true);

    $this->workerCount = count($this->workers);

    while ($this->workerCount > 0 && $this->timeoutStart + (float)$this->timeout > microtime(true)) {

        $this->collect(function ($task) {

            if ($task->isCompleted()) {

                $this->data = array_merge($this->data, json_decode($task->data, true));
                $this->workerCount--;

            }
            return $task->isCompleted();

        });

    }

    $this->shutdown(); 

    return $this->data;

}

}

And the error I'm getting is the following:

PHP Fatal error: Uncaught Error: Cannot access private property interfacePool::$timeoutStart in /usr//local/apache2/htdocs/01_Web/controllers/interface.controller.php:21

Stack trace:

0 /usr/local/apache2/htdocs/01_Web/controllers/interface.controller.php(110): interfacePool->process()

1 /usr/local/apache2/htdocs/01_Web/libs/core.class.php(221): interfaceCtrl->getTariffs()

2 /usr/local/apache2/htdocs/01_Web/index.php(35): core->run()

3 {main}
  thrown in /usr/local/apache2/htdocs/01_Web/controllers/interface.controller.php on line 21

The line on which the error occurs is the $this->timeoutStart = microtime(true).

The class interfacePool is in the interface.controller.php file (I'm not trying to access those variables from somewhere else). These errors occur through the whole project; everywhere I have protected or private variables.

Solution

  • It simply is a bug in pthreads.

    https://github.com/krakjoe/pthreads/commit/c521adc7b645b9a60f8c3e9b6f1331c7dc6b428b is using EG(fake_scope) wrongly, ending up with a NULL scope for the constructor call instead of zend_get_executed_scope. (This line fcc.calling_scope = scope; should be fcc.calling_scope = zend_get_executed_scope(); instead.)

    And a NULL scope is, internally, equivalent to not being in any class context (i.e. no private nor protected access), explaining your behavior here.

    Update: Fixed in https://github.com/krakjoe/pthreads/commit/ec1b2fdd6e562db7224662ed79125d8f6dde9f44