Convert node ID from string to integer

Question

Retrieve a node based on condition:

$query = \Drupal::entityQuery('node')
->condition('type', 'my_content_type')
->condition('title', 'my node title');
$nid = $query->execute();

The result of $nid is the correct node ID but the format is a string, (es: "123")

When I want to load the node by its ID, I write:

$node_id = Node::load($nid);

Doing this, the result I get is NULL because the variable $nid is holding a string (not integer). If I write the code like this:

$node_id = Node::load(123);

I get the node loaded.

How can I convert the variable string ($nid) as an integer ? I tried:

$nid_int = (int) $nid;
$node_id = Node::load($nid_int);

also I tried:

$nid_int = intval($nid);
$node_id = Node::load($nid_int);

But I alwas get result NULL

Thanks for your help

Answer 1

the $query->execute(); return an array of key/value like [KEY => nid1]:
if you are sure you have only one node with that tittle you should get the first element of the array it's your nid try with:

 $query = \Drupal::entityQuery('node')
  ->condition('type', 'my_content_type')
  ->condition('title', 'my node title');
$nids = $query->execute();
// Get the nid in the array.
$nid = reset($nids);
$node = Node::load($nid);