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Just stumbled over an issue that tep_round does not format negative numbers correctly. Here a fix to this issue:
// Wrapper function for round()
function tep_round($number, $precision) {
$negative_number = false;
if($number < 0){
$negative_number = true;
$number = $number * -1;
}
if (strpos($number, '.') && (strlen(substr($number, strpos($number, '.')+1)) > $precision)) {
$number = substr($number, 0, strpos($number, '.') + 1 + $precision + 1);
if (substr($number, -1) >= 5) {
if ($precision > 1) {
$number = substr($number, 0, -1) + ('0.' . str_repeat(0, $precision-1) . '1');
} elseif ($precision == 1) {
$number = substr($number, 0, -1) + 0.1;
} else {
$number = substr($number, 0, -1) + 1;
}
} else {
$number = substr($number, 0, -1);
}
}
if($negative_number == true){
$number = $number * -1;
}
return $number;
}
HTH
Gunter
