What are the parameters are used in add_action and filters?
From Codex: Usage add_action( $hook, $function_to_add, $priority, $accepted_args ); Parameters $hook (string) (required) The name of the action to which $function_to_add is hooked. (See Plugin API/Action Reference for a list of action hooks). Can also be the name of an action inside a theme or plugin file, or the special tag “all”, in which case … Read more