$return = `$create_cmd 2>&1`;
if (strpos($return, 'ERROR') !== false) {
trigger_error($this->rrd_file.' - rrd version error: '.$return, E_USER_WARNING);
$return = `$create_cmd 2>&1`;
if (strpos($return, 'ERROR') !== false) {
trigger_error($this->rrd_file.' - rrd version error: '.$return, E_USER_WARNING);