How to use register_taxonomy_taxonomy_args filter in WordPress

register_taxonomy_taxonomy_args filter

The dynamic portion of the filter name, $taxonomy, refers to the taxonomy key.

To use register_taxonomy_taxonomy_args filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at WePlugins always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_register_taxonomy_taxonomy_args_defaults which takes 3 parameters and we registered using add_filter. The first parameter register_taxonomy_taxonomy_args is the name of the hook, the second parameter modify_register_taxonomy_taxonomy_args_defaults is the name of the function which needs to be called, the third parameter is the priority of calling the hook if the same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometimes, you have to remove a registered hook so you can use remove_filter to remove register_taxonomy_taxonomy_args filter.

Parameters

Below are the 3 parameters required to use this hook.

• $args : (array) Array of arguments for registering a taxonomy. See the register_taxonomy() function for accepted arguments.
• $taxonomy : (string) Taxonomy key.
• $object_type : (string[]) Array of names of object types for the taxonomy.

Live Example

apply_filters( "register_{$taxonomy}_taxonomy_args", array $args, string $taxonomy, string[] $object_type )

Below is an example of how you can use this hook.

    function weplugins_modify_register_taxonomy_taxonomy_args_defaults($args, $taxonomy, $object_type) { 
        // Update the $args variable according to your website requirements and return this variable. You can modify the $args variable conditionally too if you want.
        return $args; 
    }
    // add the filter
    add_filter( "register_taxonomy_taxonomy_args", "weplugins_modify_register_taxonomy_taxonomy_args_defaults", 10, 3 );
    

Example 1: Modify Taxonomy Arguments

This example demonstrates how to change the arguments of a taxonomy.

    function weplugins_modify_register_taxonomy_taxonomy_args_defaults($args, $taxonomy, $object_type) {
        if ($taxonomy === 'category') {
            $args['hierarchical'] = true;
        }
        return $args;
    }
    add_filter("register_taxonomy_taxonomy_args", "weplugins_modify_register_taxonomy_taxonomy_args_defaults", 10, 3);
    

Example 2: Conditional Argument Changes

Here’s how you can modify the arguments conditionally based on the taxonomy.

    function weplugins_modify_register_taxonomy_taxonomy_args_defaults($args, $taxonomy, $object_type) {
        if (in_array('post', $object_type)) {
            $args['public'] = false;
        }
        return $args;
    }
    add_filter("register_taxonomy_taxonomy_args", "weplugins_modify_register_taxonomy_taxonomy_args_defaults", 10, 3);
    

Example 3: Remove a Hook Callback

This example shows how to remove a hook callback.

    remove_filter("register_taxonomy_taxonomy_args", "weplugins_modify_register_taxonomy_taxonomy_args_defaults", 10, 3);
    

Please make sure to provide the same callback function name, priority, and number of arguments while removing the hook callback.

If you’re having any trouble using this hook, please Contact Us and we’d be happy to assist you.