Function and usage of get_metadata_default() in wordpress

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    2024-01-07T12:14:12+00:00

    The get_metadata_default() function in WordPress is used to retrieve the default metadata value for a specified meta key and object. Here's a detailed explanation of this function and its usage:

    Function:

    • Name: get_metadata_default
    • Purpose: Retrieves the default metadata value for the specified meta key and object.

    Description:

    This function is particularly useful when you want to obtain the default value of a meta field associated with different types of WordPress objects like posts, comments, terms, or users. The default value returned depends on whether you are retrieving a single meta value or multiple values.

    • Default Return Value:
      • Returns an empty string if $single is set to true.
      • Returns an empty array if $single is false.

    Parameters:

    1. $meta_type (string, required):

      • Specifies the type of object the metadata is for.
      • Acceptable values include 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
    2. $object_id (int, required):

      • The ID of the object for which the metadata is being retrieved.
    3. $meta_key (string, required):

      • The metadata key whose default value you want to retrieve.
    4. $single (bool, optional):

      • Determines the format of the return value.
      • If set to true, the function returns only the first value of the specified $meta_key.
      • Defaults to false.
      • Note: This parameter has no effect if $meta_key is not specified.

    Return:

    • Type: mixed
    • Values:
      • An array of default values if $single is false.
      • The default value of the meta field if $single is true.

    Sample Usage:

    Here's an example of how get_metadata_default() might be used in a WordPress plugin or theme:

    // Assume we want to retrieve the default metadata for a post with ID 123
    $post_id = 123;
    $meta_key = 'some_meta_key';
    
    // Retrieve the single default value of the specified meta key
    $single_default_value = get_metadata_default('post', $post_id, $meta_key, true);
    
    // Retrieve all default values of the specified meta key
    $all_default_values = get_metadata_default('post', $post_id, $meta_key, false);
    
    // $single_default_value will contain a string (the default value or empty string if none)
    // $all_default_values will be an array of default values or an empty array if none
    

    In this example, the function is used to retrieve the default metadata for a post object. Depending on the $single parameter, it can return either a single default value or an array of default values.

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