Function and usage of get_the_terms() in wordpress

Question

Answers ( 1 )

    0
    2024-01-08T14:53:59+00:00

    The get_the_terms() function in WordPress is used to retrieve the terms of a specific taxonomy that are attached to a post. Here's a detailed explanation of this function along with its parameters and return values:

    Function:

    • Name: get_the_terms
    • Purpose: Retrieves the terms of the specified taxonomy that are attached to the post.

    Parameters:

    1. $post (int|WP_Post) - Required

      • Description: This parameter specifies the post for which you want to retrieve the terms. It can be either the post ID (as an integer) or a WP_Post object.
      • Example: 123 (for a post with ID 123) or $post (a WP_Post object).
    2. $taxonomy (string) - Required

      • Description: This parameter specifies the taxonomy for which you want to retrieve terms. Taxonomy refers to a grouping mechanism for posts (or links or custom post types), such as categories or tags.
      • Example: 'category', 'post_tag', 'custom_taxonomy_name'

    Return Values:

    • WP_Term[]|false|WP_Error
      • WP_Term[]: If successful, the function returns an array of WP_Term objects, each representing a term within the taxonomy.
      • false: The function returns false if there are no terms associated with the post in the specified taxonomy or if the post does not exist.
      • WP_Error: If the function encounters an error, it returns a WP_Error object.

    Sample Usage:

    $post_id = get_the_ID(); // Gets the current post's ID
    $taxonomy = 'category'; // Taxonomy name, e.g., 'category', 'post_tag'
    
    $terms = get_the_terms( $post_id, $taxonomy );
    
    if ( is_array( $terms ) ) {
        foreach ( $terms as $term ) {
            echo $term->name . '<br>'; // Output the term name
        }
    } elseif ( is_wp_error( $terms ) ) {
        echo 'Error: ' . $terms->get_error_message();
    } else {
        echo 'No terms found for this post.';
    }
    

    In this example, get_the_terms is used to fetch all the categories ('category' taxonomy) associated with the current post. It then checks if the return value is an array (indicating success) and outputs the names of the terms. If there's an error, it outputs the error message, and if no terms are found, it displays a relevant message.

Leave an answer