first 500 from 1300 and do something with it [closed] - php

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Lets say we have 1300 units. now i want to first 500 units to be a price of 12 euro and the other 800 a price of 9 euro.
So what i basicly need is a function that calculates over a total number and gets the first 500 * 12 euro and the other 800 * 9 euro. But the total unit can also be 5000 instead of this example of 1300 unit, its user input ofcouse.
<?php
$total = 1300;
$sub = 1;
$sub2 = 1;
for($i=1; $i<=$total; $i++)
{
for($sub; $i<=500; $sub++)
{
$sub2 += $sub;
break;
}
}
echo $sub2;
?>

Answer 1

<?php
$units = 1300;
$cut_off=500;//made it a var just in case
$a=12;//fist 500
$b=9;//rest
//verbose calculations, you don't really need to create the extra variables
$a_total=$cut_off*$a;
$b_total=($units-$cut_off)*$b;
$grand_total=$a_total+$b_total;
?>
you should probably add a check if the units imputed is less than 500. or things will turn out weird

Answer 2

Updated:
<?php
function calc_total($qtt, $min = 500, $fst_price = 12, $nxt_price = 9){
if($qtt > $min) return false; // Check if the minimum 500 was sent.
/* First calculate the rest, which is the quantity sent by
the user without the minimum x 9. Then add the minimum x 12 */
$total = (($qtt - $min) * 9) + ($min * 12);
return $total;
}
?>
You can call the function like this:
echo "$". calc_total(1300);