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How to reference a function from a class in a different file which is also namespaced?

Firstly, to do this the register_metaboxes() method needs to be static: public static function register_metaboxes() { } Then, for the callback you pass an array with the full class name including the namespace … 'register_metaboxes' ], ); If, for whatever reason, register_metaboxes() isn't static (i.e. you're using $this) then passing the class name isn't enough, you need to pass an instance of the class: namespace
Jacob Peattie's user avatar
1 vote
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wp_localize_script() and JavaScript namespaces

The way wp_localize_script() is supposed to be used is for that 2nd argument to be your namespace. … If you also use the namespace in your script, instead of initialising the object, retrieve the object created by WordPress (or fall back to a new object if it's missing) and add to it: var namespace_name …
Jacob Peattie's user avatar