How Can Class Methods Be Utilized as Callbacks?

How to Utilize Class Methods as Callbacks

In scenarios where you have methods within a class that you wish to employ as callbacks, it is essential to grasp the various approaches to passing them as arguments. The PHP callable manual provides comprehensive guidance on this subject. Here's a breakdown of the options:

Method of an Instantiated Object:

<code class="php">[object instance, 'method name']</code>

This approach allows you to call a method from within the same class or from another class. For example:

<code class="php">$this->processSomething([$this, 'myCallback']);
$myObject->processSomething([new MyClass(), 'myCallback']);</code>

Static Class Methods:

<code class="php">[class name, 'static method name']</code>

When a callback parameter is available, static class methods can be passed without instantiating an object. This technique applies both inside and outside the same class:

<code class="php">$this->processSomething([__CLASS__, 'myStaticCallback']);
$myObject->processSomething(['\Namespace\MyClass::myStaticCallback']);</code>

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