您需要为此添加两次\\u操作。用户注册时一个&；第二，当用户尝试登录时。

function wpse_149067( $user_id ) {

    if ( user_can( $user_id, \'tutor\' ) )
        update_user_meta($user_id, \'verified_user\', false);

    if ( user_can( $user_id, \'student\' ) )
        update_user_meta($user_id, \'verified_user\', true);
}
add_action( \'wp_login\', \'wpse_149067_check_user\', 10, 2);

function wpse_149067_check_user($user_login, $user){
    $user_id = $user->ID;

    if ( current_user_can( $user_id, \'tutor\' ) && false == get_user_meta($user_id, \'verified_user\') ) {
        // Do your stuff here 
        // eg: echo \'Please verify your account \';

    }       
}

?>