PHP automatic binding of $this, is it a copy or an extend?

Question

When using an anonymous PHP function that is defined inside a class context, the docs say "the current class is automatically bound to it, making $this available inside of the function's scope".

But I'm a little confused what that means, does it mean the anonymous function has a copy of the class or is it now part of the class? So if I use the anonymous function to make changes to the class, they will stay in the original class where the anonymous function was defined?

Alex Granados · Accepted Answer · 2020-05-29 11:58:39Z

$this variable inside anonymous function in PHP is not a copy, is a binding, so if you alter the content of $this inside the anonymous function, the parent class would be affected.

You can check it running this snippet:

class Foo { private $test = 1; function __construct() { $func = function() { $this->test = 2; }; $func(); var_dump($this); } }; new Foo();

Thank you for clearing that up. If an anonymous function had lots of calls to it and it alters content of $this could they start to overlap, is that even possible?

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