PHP round & ceiling not correctly parsing data

Question

The numbers that are being pulled from an xml file and then assigned to a variable but are outputted incorrectly. I'm not quite sure why or how to get around it. An example is this.

$pricing_high = 1.15;
echo $pricing_high;

This displays 1.15 obviously. But when I assign this like so:

$price = ceil($pricing_high / 0.05) * 0.05;
echo $price;

This displays 2.

$price = round($pricing_high / 0.05) * 0.05;
echo $price;

This displays 1.

How do I get numbers to correctly round up to the nearest 5 cents when passing it like this?

Answer 1

As of PHP documentation for round function:

http://php.net/manual/en/function.round.php

You can specify precision as second parameter:

$pricing_high = 1.15;
$price = round($pricing_high / 0.05, 2) * 0.05;
echo $price;

Note value of second parameter 2

Answer 2

Is 1.15 = 1 dollar and 15 cents? If so:

echo sprintf('%.2f', round($price / 0.05) * 0.05); // Rounds to nearest
echo sprintf('%.2f', ceil($price / 0.05) * 0.05); // Rounds up

Tests:

$price = 1.13;

echo sprintf('%.2f', round($price / 0.05) * 0.05); // Outputs: 1.15
echo sprintf('%.2f', ceil($price / 0.05) * 0.05); // Outputs: 1.15

$price = 1.12;

echo sprintf('%.2f', round($price / 0.05) * 0.05); // Outputs: 1.10
echo sprintf('%.2f', ceil($price / 0.05) * 0.05); // Outputs: 1.15

If 1.15 = 1.15 cents then replace 0.05 with 5.

Answer 3

As ceil() and floor() don't have this precision, you might multiply your results and divide it after.