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I have a class file and I have separated out my custom post types into their own files in a sub-folder for neatness, readability, etc.

I want to init the CPT now in my plugin's index.php class. My class is initialised on the plugins_loaded action and in my construct I have the following:

public function __construct() {
    add_action('admin_enqueue_scripts', array($this,'init_admin_scripts'));
    add_action('wp_enqueue_scripts', array($this,'init_frontend_scripts'));
}

The above actions refer to functions that are in the index.php file itself. My CPTs are in a subfolder called cpt. What is the correct way to add the action for the functions in a subfolder?

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    Why not use include or require before calling those functions? – Jack Johansson Aug 23 '18 at 12:02
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Adding an action doesn't do anything except putting the callback function in the queue of the corresponding hook. It doesn't check if the function exists, let alone load a file where the function is resident.

Only when the corresponding hook is fired PHP looks for the function. If it is not loaded by then it simply throws an error:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'yada_yada' not found or invalid function name in /../wp-includes/class-wp-hook.php on line 286

So, you are yourself responsible for loading the file where the function resides using include or require before the admin_enqueue_scripts hook is fired. Refer to the hook order list to check if you're hooking timely. If you're hooking everything into plugins_loaded you should be fine.

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