Function and usage of get_bookmark_field() in wordpress

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    2024-01-06T16:20:36+00:00

    The get_bookmark_field() function in WordPress is used to retrieve a specific piece of data or field from a bookmark object. Here's a detailed explanation of this function:

    Function:

    • Name: get_bookmark_field()

    Purpose:

    • To retrieve a single bookmark data item or field.

    Parameters:

    1. $field (string, required):

      • Description: The name of the data field to return.
      • Example Values: 'name', 'url', 'description', etc.
    2. $bookmark (int, required):

      • Description: The bookmark ID for which the field is being retrieved.
      • Example Values: A numeric value representing the bookmark ID.
    3. $context (string, optional):

      • Description: The context in which the field will be used. It affects how the data is sanitized and filtered.
      • Default Value: 'display'.
      • Other Possible Values: 'edit', 'db', etc., depending on how you want to manipulate or display the data.

    Return Values:

    • Type: string|WP_Error
    • Description: The function returns the value of the specified field if successful. If an error occurs, it returns a WP_Error object.

    Sample Usage:

    Example 1: Retrieve the Name of a Bookmark

    $bookmark_id = 123; // Replace with your bookmark ID
    $bookmark_name = get_bookmark_field('name', $bookmark_id);
    
    if (!is_wp_error($bookmark_name)) {
        echo 'Bookmark Name: ' . esc_html($bookmark_name);
    } else {
        echo 'Error retrieving bookmark name.';
    }
    

    Example 2: Retrieve the URL of a Bookmark in Edit Context

    $bookmark_id = 456; // Replace with your bookmark ID
    $bookmark_url = get_bookmark_field('url', $bookmark_id, 'edit');
    
    if (!is_wp_error($bookmark_url)) {
        echo 'Edit Bookmark URL: ' . esc_url($bookmark_url);
    } else {
        echo 'Error retrieving bookmark URL.';
    }
    

    Notes:

    • It's important to validate and sanitize the output of get_bookmark_field() especially when the context is 'edit' or 'db'.
    • Handle the WP_Error return type to ensure robust error handling in your code.
    • The function is part of the WordPress Bookmark (Link) functionality, which might not be widely used in modern WordPress themes.

    This function is useful when you need to retrieve specific information about a bookmark in WordPress, such as displaying a list of bookmark names or URLs on a page or in a widget.

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