confused by PHP's bcmul() scale

Why is this outputting 87.5 and not 87.50?

<?php

$quantity = 25;
switch ($quantity)
{
    case ($quantity <= 50):
        $price = 3.50;
        break;
    case ($quantity <= 100):
        $price = 3.00;
        break;
    default:
        break;

}
echo bcm开发者_运维知识库ul($price, $quantity, 2);
// 87.5

?>

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It is rounding the 87.50 as 87.5 would be the same. To fix, you'd need:

number_format("87.50",2);

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Use number_format() instead of bcmul()

echo number_format(bcmul($price, $quantity, 2), 2, '.'); // forces to output always 2 diget after .

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Mathmatically 87.5 is 87.50. If you need additional number padding, you can use number_format or money_format to display the extra 0

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for php < 7.3 use

$val = bcmul('2', '5', 2);
$val = number_format($val, 2, '.', '');

// $val = "10.00"

or use php >= 7.3 it fixed

https://www.php.net/manual/en/function.bcmul.php#refsect1-function.bcmul-notes