Registering Class methods as hook callbacks

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I’m not sure if I have done this correctly.

As I understand it:

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if I have a class foo and a static method bar I can register that as the callback by passing the array array("foo","bar") as the function name.

If I have an instance of a class in $foo and want to call the method bar I pass the array array($foo,'bar').

If I need to register an action inside the class itself would it work with array($this,'bar')?

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2 comments

  1. If I need to register an action inside the class itself would it work with array($this, 'bar')?

    Yes, it works. $thisDocs is referring to the concrete instance needed for the callback. That’s exactly like the $foo example you give. It’s just that $this is bit more special, but it represents basically the same and it works flawlessly with callbacks in PHP.

    Additional:

    if I have a class foo and a static method bar I can register that as the callback by passing the array array("foo","bar") as the function name.

    Yes you can do so, for the static function, you can write it as a string instead of the array as well: foo::bar, see Callbacks Docs. Might be handy.

  2. For static methods you can also do this:

    ['foo','bar']

    when the following gives Undefined class constant ‘bar’:

    foo::bar

    example – when specifying the $control_callback for wp_add_dashboard_widget