Function and usage of get_term_meta() in wordpress

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    2024-01-08T11:47:10+00:00

    The get_term_meta() function in WordPress is used to retrieve metadata for a term in a taxonomy. Here's a detailed explanation of its function and usage:

    Function:

    get_term_meta( int $term_id, string $key = '', bool $single = false ): mixed

    This function is designed to fetch metadata associated with a term in a taxonomy (like categories or tags in WordPress).

    Parameters:

    1. $term_id (int, required): This is the ID of the term whose metadata you want to retrieve. The term ID must be a valid numeric value.

    2. $key (string, optional): This parameter specifies the meta key for which you want to retrieve the value. If left empty (''), the function will return all metadata keys and their values for the specified term. The default value is an empty string.

    3. $single (bool, optional): This parameter determines how the function returns the value of the meta field. If set to true, the function will return only the first value of the specified meta key. If false (the default), it returns an array of values for the meta key. This parameter is effective only when $key is specified.

    Return:

    The return type is mixed, meaning it can return different types of values based on the parameters passed:

    • Array of values: If $single is false and $key is specified, it returns an array of values associated with the meta key.
    • Single value: If $single is true and $key is specified, it returns the first value of the specified meta key.
    • False: If an invalid $term_id (non-numeric, zero, or negative value) is passed.
    • Empty string: If a valid but non-existing term ID is passed.

    Sample Usage:

    Example 1: Retrieve All Metadata for a Term

    $term_id = 123; // Replace with a valid term ID
    $all_meta = get_term_meta($term_id);
    
    // $all_meta is an associative array of all meta keys and their values
    

    Example 2: Retrieve Specific Meta Key Value

    $term_id = 123; // Replace with a valid term ID
    $key = 'some_meta_key'; // Meta key to retrieve
    $value = get_term_meta($term_id, $key, true);
    
    // $value contains the value of 'some_meta_key'
    

    Example 3: Retrieve All Values of a Specific Meta Key

    $term_id = 123; // Replace with a valid term ID
    $key = 'some_meta_key'; // Meta key to retrieve
    $values = get_term_meta($term_id, $key, false);
    
    // $values is an array of all values associated with 'some_meta_key'
    

    Notes:

    • Ensure that the term ID is valid and corresponds to an existing term.
    • The function is particularly useful when working with custom taxonomies or when you need to store additional information for terms in WordPress.

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