PHP Adding a method to a class via the constructor

Question

how would I go about adding a method to a PHP class via its constructor to be called back at a later date?

Say I have a PHP class like this:

class Action { public $callback = null; public function __construct(callable $callback) { $this->callback = $callback; } }

And I want to be able to call that method like this:

$action = new Action(function($value) { // do something with $value; }); $action->callback('abc');

However when I do the above I get this error:

Call to undefined method Action::callback()

I've tried googling for some answers however so far I haven't had much luck, any advice would be much appreciated.

@LawrenceCherone do you have an example of how I can use __call()? — Cam Parry
– Cam Parry, Commented Nov 26, 2022 at 18:14

Syscall · Accepted Answer · 2022-11-26 17:55:01Z

You are trying to call a function named 'callback'. You can get the property to call it:

call_user_func($action->callback, 'abc');

or

$fn = $action->callback; $fn('abc');

Example:

 class Action { public $callback = null; public function __construct(callable $callback) { $this->callback = $callback; } } $action = new Action(function($value) { var_dump($value); }); call_user_func($action->callback,12); // int(12) $fn = $action->callback; $fn('abc'); // string(3) "abc"

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