Paypal and OC total amount diffrence problem

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$total += $value;

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$total += round($value, 2);

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<?php
$price = 13.1154;
$number_of_items = 23;

$total_1 = round($price * $number_of_items, 4);

$total_2 = round($price, 2) * $number_of_items;

$diff = round($total_1 - $total_2, 2);

echo "Item price: <b>" . $price . "</b> (this will be displayed as " . round($price, 2) .")<br />";
echo "# of items: <b>$number_of_items</b><br /><br />";

echo "OC Total: <b>$total_1</b>" . " <=> round(" . $price . " * " . $number_of_items . ", 4)" . " (this will be displayed as " . round($total_1, 2) ." because OC rounds product price for display, but it computes with 4 digit price)<br /><br />";

echo "PP Total: <b>" . $total_2 . "</b> <=> round(" . $price . ", 2) * " . $number_of_items . " = " . round($price, 2) . " * " . $number_of_items . " (PP price has to be rounded before sending and we have to use that price when calculating total for amounts to match)<br /><br />";

echo "Diff: <b>" . $diff . '</b> (the difference between OC and PP price also needs to be rounded so we can include it as a tax or discount)'; echo "<br /><br />";

echo "Corrected PP Total: <b>" . ($diff + $total_2) . '</b> (final price to be sent to PP with difference applied)'; echo "<br />";

?>

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Item price: 13.1154 (this will be displayed as 13.12)
# of items: 23

OC Total: 301.6542 <=> round(13.1154 * 23, 4) (this will be displayed as 301.65 because OC rounds product price for display, but it computes with 4 digit price)

PP Total: 301.76 <=> round(13.1154, 2) * 23 = 13.12 * 23 (PP price has to be rounded before sending and we have to use that price when calculating total for amounts to match)

Diff: -0.11 (the difference between OC and PP price also needs to be rounded so we can include it as a tax or discount)

Corrected PP Total: 301.65 (final price to be sent to PP with difference applied)

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Item price: 13.4949 (this will be displayed as 13.49)
# of items: 100

OC Total: 1349.49 <=> round(13.4949 * 100, 4) (this will be displayed as 1349.49 because OC rounds product price for display, but it computes with 4 digit price)

PP Total: 1349 <=> round(13.4949, 2) * 100 = 13.49 * 100 (PP price has to be rounded before sending and we have to use that price when calculating total for amounts to match)

Diff: 0.49 (the difference between OC and PP price also needs to be rounded so we can include it as a tax or discount)

Corrected PP Total: 1349.49 (final price to be sent to PP with difference applied)

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Item price: 13.4951 (this will be displayed as 13.5)
# of items: 100

OC Total: 1349.51 <=> round(13.4951 * 100, 4) (this will be displayed as 1349.51 because OC rounds product price for display, but it computes with 4 digit price)

PP Total: 1350 <=> round(13.4951, 2) * 100 = 13.5 * 100 (PP price has to be rounded before sending and we have to use that price when calculating total for amounts to match)

Diff: -0.49 (the difference between OC and PP price also needs to be rounded so we can include it as a tax or discount)

Corrected PP Total: 1349.51 (final price to be sent to PP with difference applied)