Bug #78408 [Opn->Nab]: Floating point rounding error

Edit report at https://bugs.php.net/bug.php?id=78408&edit=1 ID: 78408 Updated by: requinix@php.net Reported by: djurredenboer at gmail dot com Summary: Floating point rounding error -Status: Open +Status: Not a bug Type: Bug Package: Math related Operating System: Linux and Mac PHP Version: 7.3.8 Block user comment: N Private report: N New Comment: Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://www.floating-point-gui.de/ Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2019-08-13 08:32:39] djurredenboer at gmail dot com Description: ------------ If you add up 0.30 and 0.15 it and then cast to integer it will end up in 44 instead of 45 Test script: --------------- <?php $test = 0.30 + 0.15; $test2 = ((int)(100 * $test)); echo $test2; Expected result: ---------------- 45 Actual result: -------------- 44 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=78408&edit=1