PHP callback - array or arrow syntax?

Question

Let's assume we have this function

<?php function run($callback) { $callback($some, $params); }

How to call it?

run($someObject->callback);

or rather

run([$someObject, 'callback']);

The first one seems better to me especially because of code suggestion but in documentation is used array notation.

Why is first one worse than second one?

Does the first one even work? It would only work if "callback" was a variable whose value was a function. — apokryfos
– apokryfos, Commented Jun 29, 2017 at 8:21
Use any of the methods described in the documentation of PHP Callables. — axiac
– axiac, Commented Jun 29, 2017 at 8:23

deceze · Accepted Answer · 2017-06-29 08:23:01Z

The array notation is better because the arrow notation doesn't work. Functions in PHP aren't first class objects which can be passed around. Whenever you "pass a function", you must pass it by name; i.e. only its name. To pass an object method, you need to pass the object and the method name using the callable pseudo type notation.

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