OCI8Statement::fetchColumn() returns null instead of false

In
public function fetchColumn($columnIndex = 0)
{
$row = oci_fetch_array($this->_sth, OCI_NUM | OCI_RETURN_NULLS | OCI_RETURN_LOBS);
return $row[$columnIndex];
}

there is no control on oci_fetch_array_() returned value.
When it returns false fetchColumn() returns null instead of false.

Solution:
public function fetchColumn($columnIndex = 0)
{
$row = oci_fetch_array($this->_sth, OCI_NUM | OCI_RETURN_NULLS | OCI_RETURN_LOBS);
return isset($row[$columnIndex]) ? $row[$columnIndex] : false;
}