我已经使用了几乎所有的Wordpress示例代码，但仍然不起作用。我已经将php文件放在wp-content/plugins/menuitem/下。代码很简单

<?php add_action(\'admin_menu\', \'donations_overview_menu\');
function donations_overview_menu() {
    add_options_page(\'Donations overview\', \'Donations overview\', \'manage_options\', \'donations-overview\', \'donations_overview\');}

function donations_overview() {
    if (!current_user_can(\'manage_options\'))  {
        wp_die( __(\'You do not have sufficient permissions to access this page.\') );
    }
    echo \'<div class="wrap">\';
    echo \'<p>Here is where the form would go if I actually had options.</p>\';
    echo \'</div>\';
}
?>