PHP unexpected result of float to int type cast

Question

I\'trying to convert a float to an int value in php:

var_dump((int)(39.3 * 100.0)); //Returns 3929 but should be 3930!
var_dump((int)(39.2 * 100.0)); //Retur         


        

Answer 1

This might be late but the proper way to do it is as follows:

(int) bcmul(39.3, 100.0); // 3930
(int) bcmul(39.2, 100.0); // 3920

and for dealing with digits / calculation for floats, or anything that involves money transaction, you should never use directly multiplication/division + casting.

please refer to this as well:

http://php.net/manual/en/book.bc.php

notice: the casting in my answer is just to convert String to Int, (you don't need to do it)