Filters (hooks) (tag)
| add_filter() | Attaches the specified PHP function to the specified filter hook. Thus, when the filter is triggered, the value will be filtered by the specified PHP function. |
| apply_filters() | Call the functions added to a filter hook. |
| current_filter() | Retrieve the name of the current filter or action. |
| doing_filter() | Retrieve the name of a filter currently being processed. |
| has_filter() | Check if any filter has been registered for a hook. |
| remove_all_filters() | Remove all of the hooks from a filter. |
| remove_filter() | Removes a function from a specified filter hook. |