PHP-通过引用传递/存储对象实例方法？

Question

As part of an attempt to get better at OOP, I'd like to implement a task queueing object that can build a list of tasks and execute them. And I am writing in PHP, because most of the work that I do has to be in that language, and this is in the context of a very basic web framework I'm trying to build.

At its simplest, the tasks would consist of a function, an array of variables, a boolean to express that the task has been completed.

Is there a way to pass an object's function in a way that I can store it in a list and then execute it later? Ideally I'd like something like:

$tasks->register($log->outputAllEntries, $logLevel);
$tasks->register($database->remove, $someRecord);
$tasks->register($log->toHTML, null);

and then later

$tasks->run();

And the run method in tasks would then run:

$log->outputAllEntries($logLevel);
$database->remove($someRecord);
$log->toHTML();

I'm having trouble figuring out how to store the reference to the functions that I want to run... is there some way of doing that in PHP? Or am I thinking about the problem ins a stupid kind of way? This seems like something pretty easy to do in Javascript, but I'm not having any luck in PHP.

Answer 1

There are a few ways you could implement this. A simple approach would, instead of:

$tasks->register($log->outputAllEntries, $logLevel);

you would do

$tasks->register($log, 'outputAllEntries', array($logLevel));

You would have for your functions:

function register($class, $method, $params) {
    $this->tasks[] = array($class, $method, $params);
}

function run() {
    foreach($this->tasks as $task) {
        list($class, $method, $params) = $task;
        call_user_func_array(array($class, $method), array($params));
    }
 }