Bug #78606 [NEW]: Wrong calculation when dealing with bigint

From: marcelotpcruz at gmail dot com Operating system: Windows/Unix PHP version: 7.3.10 Package: Math related Bug Type: Bug Bug description:Wrong calculation when dealing with bigint Description: ------------ Using a 64 bit install on a 64 bit system: Test script: --------------- <?php $someInt = 36028797018963968;//2^55 echo $someInt . '<br>'; echo number_format($someInt, 10, '.', '') . '<br>'; $someInt-= 10; if((PHP_INT_MAX + 1) === (PHP_INT_MAX + 2)) //This should be false echo 'This should never be echoed<br>'; echo number_format($someInt, 10, '.', '') . '<br>';//Value here is just $someInt minus 10 $maxInt = PHP_INT_MAX; echo $maxInt . '<br>'; echo ++$maxInt . '<br>'; echo --$maxInt . '<br>';//Should print 9223372036854775807 echo number_format(PHP_INT_MAX, 0, '.', '') . '<br>';//Should print 9223372036854775807 Expected result: ---------------- 36028797018963968 36028797018963968.0000000000 36028797018963958.0000000000 9223372036854775807 9.2233720368548E+18 9223372036854775807 9223372036854775807 Actual result: -------------- 36028797018963968 36028797018963968.0000000000 This should never be echoed 36028797018963960.0000000000 9223372036854775807 9.2233720368548E+18 9.2233720368548E+18 9223372036854775808 -- Edit bug report at https://bugs.php.net/bug.php?id=78606&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78606&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78606&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78606&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78606&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78606&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78606&r=support Expected behavior: https://bugs.php.net/fix.php?id=78606&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78606&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78606&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78606&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78606&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78606&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78606&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78606&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78606&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78606&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78606&r=mysqlcfg