Bug #75254 [NEW]: json_encode float

From: 845861050 at qq dot com Operating system: centos 6.5 PHP version: 7.1.9 Package: *General Issues Bug Type: Bug Bug description:json_encode float Description: ------------ <?php $a=1.2; $b=1; $c=$a-$b; echo json_encode($c); ?> php.ini : serialize_precision =-1 sometimes it echo 0.2 ; sometimes it echo 0.1999999999999996 Test script: --------------- <?php $a=1.2; $b=1; $c=$a-$b; echo json_encode($c); ?> php.ini : serialize_precision =-1 sometimes it echo 0.2 ; sometimes it echo 0.1999999999999996 Expected result: ---------------- sometimes it echo 0.2 ; sometimes it echo 0.1999999999999996 Actual result: -------------- json_encode float error -- Edit bug report at https://bugs.php.net/bug.php?id=75254&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75254&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75254&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75254&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75254&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75254&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75254&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75254&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75254&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75254&r=support Expected behavior: https://bugs.php.net/fix.php?id=75254&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75254&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75254&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75254&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75254&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75254&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75254&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75254&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75254&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75254&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75254&r=mysqlcfg