Function and usage of get_the_category_by_ID() in wordpress

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    2024-01-08T14:18:33+00:00

    The get_the_category_by_ID() function in WordPress is used for retrieving the name of a category from its ID. Here's a detailed explanation of its usage:

    Function:

    get_the_category_by_ID( int $cat_id ): string|WP_Error
    

    Parameters:

    • $cat_id (int, required): The ID of the category you want to retrieve the name for.

    Return:

    • This function returns the category name as a string on success. If the category ID does not exist or there's an error, it returns WP_Error.

    Usage Example:

    Here's a sample usage of get_the_category_by_ID():

    $cat_id = 4; // Assume 4 is a valid category ID
    $category_name = get_the_category_by_ID( $cat_id );
    
    if ( !is_wp_error( $category_name ) ) {
        echo 'Category Name: ' . $category_name;
    } else {
        echo 'Error: ' . $category_name->get_error_message();
    }
    

    In this example:

    1. We've assigned a category ID to the variable $cat_id.
    2. We then call get_the_category_by_ID() with $cat_id as the argument.
    3. The function returns the name of the category if the ID is valid.
    4. If the function returns a WP_Error, we handle it by displaying the error message.

    This function is particularly useful when you have the category ID and need to display or utilize the category name in your WordPress theme or plugin.

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