Bug #76934 [Nab]: json encode bug php 7.1 and above

Edit report at https://bugs.php.net/bug.php?id=76934&edit=1 ID: 76934 Updated by: nikic@php.net Reported by: grzesiek dot kesik at gmail dot com Summary: json encode bug php 7.1 and above Status: Not a bug Type: Bug Package: JSON related Operating System: any PHP Version: 7.1.22 Block user comment: N Private report: N New Comment: You will have to change it to a lower value such as 14 to restore the previous behavior. However, you should seriously consider if that's really what you want -- you are actively corrupting your JSON output by reducing the precision with which floating point numbers are exported. Are you sure that is what you want to do? Most likely it is not. Previous Comments: ------------------------------------------------------------------------ [2018-09-26 09:30:03] grzesiek dot kesik at gmail dot com According to requinix@php.net comment, I have changed serialize_precision setting to 17 (as in php 7.0 http://php.net/manual/en/ini.list.php). For me it does not work. After restarting apache i still gets this rounding issue. ------------------------------------------------------------------------ [2018-09-26 08:55:34] requinix@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php http://php.net/manual/en/function.json-encode.php > Changelog > 7.1.0 serialize_precision is used instead of precision when encoding double values. http://php.net/manual/en/ini.core.php#ini.serialize-precision Check your serialize_precision setting. ------------------------------------------------------------------------ [2018-09-26 08:53:43] grzesiek dot kesik at gmail dot com Description: ------------ After some calculation json_encode encounter problem with casting numbers Test script: --------------- <?php $n1 = 9.79; $n2 = $n1 *100; echo $n1; echo ' '; echo $n2; echo ' '; echo json_encode($n2); echo ' '; $n3 = 979; echo json_encode($n3); Expected result: ---------------- echo json_encode($n2); should be equals 979 Actual result: -------------- echo json_encode($n2); is equal 978.9999999999999 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76934&edit=1