Bug #77425 [Opn->Nab]: Operator error

Edit report at https://bugs.php.net/bug.php?id=77425&edit=1 ID: 77425 Updated by: requinix@php.net Reported by: karolyizoltan dot 1 at gmail dot com Summary: Operator error -Status: Open +Status: Not a bug Type: Bug Package: Math related Operating System: Windows 8.1 PHP Version: 7.1.25 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: ------------------------------------------------------------------------ [2019-01-07 16:56:52] karolyizoltan dot 1 at gmail dot com Description: ------------ SYSTEM I test here by PHP 7.2.4 as well: http://sandbox.onlinephpfunctions.com/ and on my desktop 7.1.25 (this come from the php is downloaded and installed from here: https://www.apachefriends.org/download.html) PROBLEM The same values in case of some operators do not result the right outcomes. All of the six cases need to be true but first four return false values. Test script: --------------- $a = '0.9'; $b = '7.34'; $c = '100'; $d = floor(($a * $b)*100)/100; $e = $c + $b - $d;//this return 100.74 too $f = 100.74; // values of variables var_dump($e); var_dump($f); //first four return false values but all of them need to be true var_dump($e == $f);//false var_dump($e <= $f);//false var_dump($f >= $e);//false var_dump($e == $f);//false var_dump($e >= $f);//true var_dump($f <= $e);//true Expected result: ---------------- All the equations need to return true value for the same numbers. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77425&edit=1