审查wp_dropdown_users() 显然有一个\'selected\' 参数所以从理论上讲，你可以在这里传递张贴的价值。

// set to the posted value, but you might be able to do this differently, depending on how you are storing the data
$selected = isset($_POST[\'author\']) ? $_POST[\'author\'] : false;

$args = array( \'name\' => \'author\',
               \'selected\' => $selected );

wp_dropdown_user( $args );