检查类是否在PHP中有方法

Question

Currently my code looks like that:

switch ($_POST['operation']) {
    case 'create':
        $db_manager->create();
        break;
    case 'retrieve':
        $db_manager->retrieve();
        break;
...
}

What I want to do is, to check if method called $_POST['operation'] exists: if yes then call it, else echo "error" Is it possible? How can I do this?

Answer 1

You can use method_exists:

if (method_exists($db_manager, $_POST['operation'])){
  $db_manager->{$_POST['operation']}();
} else {
  echo 'error';
}

Though I strongly advise you don't go about programming this way...