I just want to know what is the difference between the add_action and add_filter. I just could not get it enough in the documentation of wordpress. Can anyone explain it more broader and simpler. Thank you in advance.
add_action is what you use to create a trigger “hook” – when something happens, do-something-else.
add_Filter add_filter is used to “hook” data change/replace – where there is [some-code], change it to some-other-expanded-code. add_filter ( string $tag, callable $function_to_add, int $priority = 10, int $accepted_args = 1 ) Hook a function or method to a specific filter action. WordPress offers filter hooks to allow plugins to modify various types of internal data at runtime. A plugin can modify data by binding a callback to a filter hook. When the filter is later applied, each bound callback is run in order of priority, and given the opportunity to modify a value by returning a new value.