Bug #70559 [Opn->Nab]: subtraction float numbers bug

Edit report at https://bugs.php.net/bug.php?id=70559&edit=1 ID: 70559 Updated by: ab@php.net Reported by: jakub dot trzcinski at valueadd dot pl Summary: subtraction float numbers bug -Status: Open +Status: Not a bug Type: Bug Package: Math related Operating System: Windows And Linux PHP Version: 5.6.13 Block user comment: N Private report: N New Comment: Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. Floating point numbers have limited precision. Often it's like 7 significant places on 32-bit and 15 on 64-bit. It is platform dependent. What you experience is therefore expected behavior. Thanks. Previous Comments: ------------------------------------------------------------------------ [2015-09-23 11:11:43] jakub dot trzcinski at valueadd dot pl Description: ------------ it's doesnt matter which is type(int/float) of seccond value, its always bad result. Test script: --------------- $a = 217.80; $b = 217; echo $a - $b; ------------------------ $a = 217.80; $b = 217.00; echo $a - $b; Expected result: ---------------- 0.8 Actual result: -------------- 0.80000000000001 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70559&edit=1