src/ArrayObject.php
public function has($key): bool
    {
        return ArrayUtility::dotRead($this->data, $this->getNormalizedKey($key)) !== null;
    }
public function has($key): bool
    {
        return ArrayUtility::dotRead($this->data, $this->getNormalizedKey($key)) !== null;
    }
public function has ( $ key ) : bool { return ArrayUtility :: dotRead ( $ this -> data , $ this -> getNormalizedKey ( $ key ) ) !== null ; }
Determine if the node contains a property.

@param string $key

@return bool
Determine if the node contains a property .