T_VARIABLE problem

class FileDirectory{    ...    [deleted for brevity]    ...    public $csvData;    function __construct()    {        ...        [deleted for brevity]        ...    }    function __destruct()    {        if(isset($this->dh))        {            if(null!=$this->dh)            {                closedir($this->dh);            }        }        if(isset($this->csvData))        {            if($this->csvData!=null)            {                delete $this->csvData;                $this->csvData=null;            }        }    }    ...    [deleted for brevity]    ...}