Make TaskNotFoundException more informative by adding task name to exception object

[mekras]

So missing task name can be determined in context where it's not known.

[mekras]

The only reason — save task name to have ability to read it later in a catch block. Example case can be found here.

[mekras]

By the way, version check can be omitted. "new self" will be enough until TaskNotFoundException has no child classes.

[jaz303]

I understand the point of the new class and agree that it's a useful change. I'm just unsure why you'd gone for TaskNotFoundException::create() instead of new TaskNotFoundException(), e.g.:

class TaskNotFoundException($taskName) {
    private $taskName;
    public function __construct($taskName) {
        $this->taskName = $taskName;
        parent::__construct();
   }
   public function getTaskName() { return $this->taskName; }
}

throw new TaskNotFoundException($taskName);
?>

[mekras]

This will break standard Exception interface in which constructor accepts arbitrary text message. With factory method we preserve default constructor behavior (getTaskName will return empty string in this case) but give a way to set task name and to be sure that it will be exactly task name, not something else.
But that's just my own opinion. It's up to you how to implement this.