taskr | small PHP library that makes it easy to fork callbacks

Before running a task, we'll need to define a handler. The handler is what the task will use to do things like writing a log or setting data about the task. In the example below, we've implemented HandlerInterface by extending HandlerAbstract with our own handler that will use a flat file for logging and MongoDB for task data. In the same file, let's create a new instance of our handler which we'll pass as the first argument to a new instance of Task. The second argument of our task object is a callable type which will be called by Task::run(). Calling $task->run() will fork the current PHP process using pcntl_fork() and run the task callable in a separate child process. In this example, the original process will end and the child process will live on writing to a log, sleeping for 2 seconds, and finally ending.