Function and usage of get_object_taxonomies() in wordpress


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    The get_object_taxonomies() function in WordPress is an essential tool for developers working with taxonomies. It's designed to retrieve the taxonomies associated with a given object, such as a post type or a specific post.


    get_object_taxonomies( string|string[]|WP_Post $object_type, string $output = ‘names’ ): string[]|WP_Taxonomy[]


    • Returns the names or objects of the taxonomies which are registered for the requested object or object type.
    • This can be particularly useful when you need to handle taxonomies dynamically based on the type of content being dealt with.


    • For example, if you want to know what taxonomies are associated with standard posts, you could use this function as follows:

      $taxonomies = get_object_taxonomies( 'post' ); 
      // This would typically return: 
      // Array( 'category', 'post_tag' )


    1. $object_type (string|string[]|WP_Post - required):

      • This parameter specifies the type of the object for which you want to retrieve taxonomies.
      • It can be a string (like 'post', 'page'), an array of such strings, or a WP_Post object (a row from the posts table in the database).
    2. $output (string - optional):

      • Determines the type of output you want.
      • It accepts either 'names' (for taxonomy names) or 'objects' (for WP_Taxonomy objects).
      • The default value is 'names'.


    • The function returns an array of either strings (taxonomy names) or WP_Taxonomy objects, depending on the value of the $output parameter.
    • The array contains all taxonomies associated with the specified $object_type.

    Example Usage:

    Let's say you want to get the taxonomies for a custom post type called 'book':

    $book_taxonomies = get_object_taxonomies( 'book', 'names' );
    // This might return something like:
    // Array( 'genre', 'author' )

    In this example, 'genre' and 'author' could be custom taxonomies that you've registered for the 'book' post type. By calling get_object_taxonomies(), you can dynamically retrieve this information within your code, making your theme or plugin more flexible and adaptable to different types of content.

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