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Is it possible to create a new action hook like do_action('my-hook-name'); inside a call to add_action();?
I'm aware this code doesn't work, but I was thinking something along the lines of...
add_action('init', do_action('my-hook-name'));
or
Is the only way to actually add a callback function to init, then inside my callback function create my hook?
add_action('init', 'my_callback');
function my_callback(){
do_action('my-hook-name');
}
Creating an answer based upon responses via comments on original question of: Is it possible to create an action hook using do_action() within add_action()?
Yes it is possible to create an action hook using do_action() on a call to add_action().
For clarification, the following code does NOT work:
add_action('init', do_action('my-hook-name'));
As stated by @IvanHanák in the comments to the original question asked; It is possible to create an action hook using do_action() on a call to add_action() by using anonymous functions.
An example of creating an action hook using do_action() on a call to add_action() using anonymous functions:
add_action('some-existing-hook-name', function(){do_action('my-new-hook-name');});
However, it should be noted that using anonymous functions can make it difficult to debug or remove hooks.
add_action('init', (function(){do_action('i_am_a_hook');}));