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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