Bug #79001 [Opn->Nab]: subtraction int from microtime(true) give a wrong result

Edit report at https://bugs.php.net/bug.php?id=79001&edit=1 ID: 79001 Updated by: cmb@php.net Reported by: dromidror at yahoo dot com Summary: subtraction int from microtime(true) give a wrong result -Status: Open +Status: Not a bug Type: Bug Package: Math related Operating System: Ubuntu 16.04.6 LTS (GNU/Linux 4. PHP Version: 7.4.1 -Assigned To: +Assigned To: cmb 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. | If get_as_float is set to TRUE, then microtime() returns a float, | which represents the current time in seconds since the Unix epoch | accurate to the nearest microsecond. Previous Comments: ------------------------------------------------------------------------ [2019-12-19 14:00:32] dromidror at yahoo dot com Description: ------------ $now_time - is the result of function microtime(true)*10000. The value is a allegedly whole number with 14 digits. ( e.g. 15767617663680). $start - is constant with value in range of $now_time value(14 digits) $run - the result of subtracting start from now_time Test script: --------------- <?php $now_time = microtime(true)*10000; $start = 15767602956637; $run = $now_time -$start ; echo ($now_time - $start), " = ", $now_time, " - ", $start; Expected result: ---------------- 14707043 = 15767617663680-15767602956637 Actual result: -------------- 14707043.460938 = 15767617663680-15767602956637 Notice that PHP returns number with friction (14707043.460938) as result of subtracting two allegedly whole numbers(15767617663680 and 15767602956637). ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79001&edit=1