- var_dump: documentation ( source)
- floor: documentation ( source)
- bcadd: documentation ( source)
<?php
/**
* @see https://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Precision-Math-with-PHP/ba-p/8368
*/
var_dump((0.2 + 1.4) * 10);
var_dump(floor((0.2 + 1.4) * 10)); // Should be 16. But it's 15!
// Using BC Math
var_dump(bcadd('0.2', '1.4', 2) * 10); // It's 16 like we would expect it to be.