Actions

This concept based on Wordpress hook functions.

add_action()

Reference: https://developer.wordpress.org/reference/functions/add_action

Function: Hooks a function on to a specific action.

add_action(string $tag, callable $function_to_add, int $priority = 10, int $accepted_args = 1)

Description

Actions are the hooks that the core launches at specific points during execution, or when specific events occur.

Plugins can specify that one or more of its PHP functions are executed at these points, using the Action API.

Parameters

$tag: (string) (Required) The name of the action to which the $function_to_add is hooked.

$function_to_add: (callable) (Required) The name of the function you wish to be called.

$priority:

$accepted_args:

do_action()

Reference: https://developer.wordpress.org/reference/functions/do_action

Function: Execute functions hooked on a specific action hook.

do_action(string $tag,  $arg = '')

Description

This function invokes all functions attached to action hook $tag. It is possible to create new action hooks by simply calling this function, specifying the name of the new hook using the $tag parameter.

You can pass extra arguments to the hooks, much like you can with apply_filters().

Parameters

$tag:

$arg,...: