How to check if a nested key exists in an array in PHP?

Question

PHP

I have a class with an EXIST() method

class X{
  private $data = ['a'=>['b'=>123], 1 => []];

  public function exists($name)	{
    return isset($this->data[$name]);
  }
}

The $this->data array is deeply nested. Is it possible to somehow pass the name of the key to the method, taking into account the nesting of the entire chain, and get the check for the presence of the key ?
$this->data = ['a'=>['b'=>123], 1 => []]
'b'

Answer 1

need to find b in any nested array (leaves or branches) or specifically in leaves?