pfSense

if($rowcountdiff < 0){

/* remove excess rows */

$r = - $rowcountdiff;

$rrdoldxml['rra'][$i]['database']['row'] = array_slice($rrdoldxml['rra'][$i]['database']['row'],$r);

$rowcountold = count($rrdoldxml['rra'][$i]['database']['row']);

if($rowcountold == $rowcountnew){

log_error(sprintf("Row count successfully reduced by $r to $rowcountold\n"));

}

}

elseif($rowcountdiff > 0) {

/* save old rows for a bit before we put the required empty rows before it */

$rowsdata = $rows;

$rowsempty = array();

$r = 0;

while($r < $rowcountdiff) {

$rowsempty[] = $rrdnewxml['rra'][$i]['database']['row'][$r];

$r++;

}

$rows = $rowsempty + $rowsdata;