Accessing associative array by object

Question

It's possible to access associative array by object? I tried to use __toString method, but it isn't automatically called.

class ColumnItem {
  private string $name;
  
  public function __construct(string $name) {
    $this->name = $name;
  }
  
  public function __toString() {
    return $this->name;
  }
}

...

$array = ['Name' => 'John'];
$nameItem = new ColumnItem('Name');
//$name = $array[$nameItem]; // PHP Fatal error:  Uncaught TypeError: Illegal offset type
$name = $array[strval($nameItem)];