src/CanvasArray.php
public function offsetGet($offset)
    {
        if (!isset($this->data[$offset])) {
            $this->requestAllPages();
        }
        return $this->data[$offset];
    }
public function offsetGet($offset)
    {
        if (!isset($this->data[$offset])) {
            $this->requestAllPages();
        }
        return $this->data[$offset];
    }
Offset to retrieve

@param int|string $offset

@return CanvasObject|null

@see http://php.net/manual/en/arrayaccess.offsetexists.php
ArrayAccess::offsetGet