$y = date('Y', strtotime($year['end']));
switch ($item['depreciation_method']) {
- case 'D':
- $value = $item['material_cost'] * $item['depreciation_rate'] / 100 / 12;
- break;
-
- case 'S':
- // depreciation_rate is the period here.
- $done_months = months_between_dates($item['depreciation_start'], $item['depreciation_date']);
- $remaining_months = $item['depreciation_rate'] * 12 - $done_months;
- $value = $item['material_cost'] / $remaining_months;
- break;
+ case 'D':
+ $line_value = $item['purchase_cost']*$item['depreciation_rate']/100/12;
+ $value = $item['material_cost'] * $item['depreciation_rate'] * $item['depreciation_factor']/100/12;
+ if ($value < $line_value)
+ $value = $line_value;
+ break;
+
+ case 'S': // purchase_cost stores start cost of item
+ $done_months = months_between_dates($item['depreciation_start'], $item['depreciation_date']);
+ $remaining_months = 12.0 * 100.0/$item['depreciation_rate'] - $done_months;
+ $value = $item['purchase_cost']*$item['depreciation_rate']/100/12;
+ break;
+
+ case 'N':
+ $N = $item['depreciation_rate'];
+ $done_years = months_between_dates($item['depreciation_start'], $item['depreciation_date'])/12;
+ $value = $item['purchase_cost']* ($N-$done_years)/($N*($N+1)/2)/12;
+ break;
case 'O':
- $value = $item['material_cost'];
- break;
+ $value = $item['material_cost'];
+ break;
}
$next = next_depreciation_date($item['depreciation_date']);
$total = 0;
$cnt = 0;
for ($i=$m; $i < $m + $no_months; $i++) {
+
+ if ($item['depreciation_method'] == 'S') {
+ if ($cnt >= $remaining_months)
+ $value = 0;
+ }
+
$date = sql2date(date("$y-$i-t", strtotime("$y-$i-1")));
$total += $value;
$cnt++;
- if ($item['depreciation_method'] == 'S') {
- if ($cnt >= $remaining_months)
- $value = 0;
- }
- elseif ($item['depreciation_method'] == 'O') {
- // depreciate only in the first month
- $value = 0;
- }
- }
+ if ($item['depreciation_method'] == 'O') {
+ // depreciate only in the first month
+ $value = 0;
+ }
+ }
return $rows;
}