这里有一个完整的示例可以帮助您开始。

注册“标记”分类法

register_taxonomy( \'marker\',
    \'post\',
    array(
        \'hierarchical\'          => false,
        \'update_count_callback\' => \'_update_post_term_count\',
        \'label\'                 => __( \'Markers\', \'textdomain\' ),
        \'labels\' => array(
                \'name\'              => __( \'Markers\', \'textdomain\' ),
                \'singular_name\'     => __( \'Marker\', \'textdomain\' ),
                \'menu_name\'         => _x( \'Markers\', \'Admin menu name\', \'textdomain\' ),
                \'search_items\'      => __( \'Search Markers\', \'textdomain\' ),
                \'all_items\'         => __( \'All Markers\', \'textdomain\' ),
                \'parent_item\'       => __( \'Parent Marker\', \'textdomain\' ),
                \'parent_item_colon\' => __( \'Parent Marker:\', \'textdomain\' ),
                \'edit_item\'         => __( \'Edit Marker\', \'textdomain\' ),
                \'update_item\'       => __( \'Update Marker\', \'textdomain\' ),
                \'add_new_item\'      => __( \'Add New Marker\', \'textdomain\' ),
                \'new_item_name\'     => __( \'New Marker Name\', \'textdomain\' )
            ),
        \'rewrite\'               => false,
    )
);

现在我们需要添加钩子来添加/保存此分类法所需的字段

add_action( \'marker_add_form_fields\',   \'marker_add_fields\', 10, 2 );
add_action( \'marker_edit_form_fields\',  \'marker_edit_fields\', 10, 2 );
add_action( \'created_marker\',           \'save_marker_meta\', 10, 2 );
add_action( \'edited_marker\',            \'save_marker_meta\', 10, 2);

此函数添加字段以添加新分类屏幕

function marker_add_fields() {
    ?>
    <div class="form-field">
        <label for="latitude"><?php _e( \'Latitude\' ); ?></label>
        <input type="text" name="latitude" id="latitude" value="">
    </div>

    <div class="form-field">
        <label for="longitude"><?php _e( \'Longitude\' ); ?></label>
        <input type="text" name="longitude" id="longitude" value="">
    </div>
    <?php
}

此功能将字段添加到分类法的编辑屏幕

function marker_edit_fields( $term, $taxonomy ) {
    $latitude   = get_term_meta( $term->term_id, \'latitude\', true );
    $longitude  = get_term_meta( $term->term_id, \'longitude\', true );
    ?>
    <tr class="form-field">
        <th scope="row" valign="top"><label for="latitude"><?php _e( \'Latitude\' ); ?></label></th>
        <td>
            <input type="text" name="latitude" id="latitude" value="<?php echo $latitude; ?>">
        </td>
    </tr>
    <tr class="form-field">
        <th scope="row" valign="top"><label for="longitude"><?php _e( \'Longitude\' ); ?></label></th>
        <td>
            <input type="text" name="longitude" id="longitude" value="<?php echo $longitude; ?>">
        </td>
    </tr>
    <?php
}

最后，此函数为我们的新分类法保存自定义字段值

function save_marker_meta( $term_id, $tt_id ){
    if( isset( $_POST[\'latitude\'] ) && \'\' !== $_POST[\'latitude\'] ){
        update_term_meta( $term_id, \'latitude\', $_POST[\'latitude\'] );
    }
    if( isset( $_POST[\'longitude\'] ) && \'\' !== $_POST[\'longitude\'] ){
        update_term_meta( $term_id, \'longitude\', $_POST[\'longitude\'] );
    }
}