Bug #70137 [NEW]: json_encode/decode should use max precision for float like values by default

From: yohgaki Operating system: any PHP version: Irrelevant Package: JSON related Bug Type: Bug Bug description:json_encode/decode should use max precision for float like values by default Description: ------------ json_encode/decode uses 'precision'. It should use 'serialize.precision' to handle float like JSON numeric to be more precise. Test script: --------------- [yohgaki@dev PHP-master]$ php -r '$v = 10/3; var_dump(json_encode($v));' string(15) "3.3333333333333" [yohgaki@dev PHP-master]$ php -r '$v = 10/3; ini_set("precision", 17);var_dump(json_encode($v));' string(18) "3.3333333333333335" [yohgaki@dev PHP-master]$ php <?php var_dump(json_decode('{ "v" : 0.12345678901234567890 }')); ini_set('precision', 17); var_dump(json_decode('{ "v" : 0.12345678901234567890 }')); ?> object(stdClass)#1 (1) { ["v"]=> float(0.12345678901235) } object(stdClass)#1 (1) { ["v"]=> float(0.12345678901234568) } -- Edit bug report at https://bugs.php.net/bug.php?id=70137&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70137&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70137&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70137&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70137&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70137&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70137&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70137&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70137&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70137&r=support Expected behavior: https://bugs.php.net/fix.php?id=70137&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70137&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70137&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70137&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70137&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70137&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70137&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70137&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70137&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70137&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70137&r=mysqlcfg