Bug #75746 [NEW]: empty string is (wrongly) accepted as valid json

From: php at richardneill dot org Operating system: Linux PHP version: 7.2.0 Package: JSON related Bug Type: Bug Bug description:empty string is (wrongly) accepted as valid json Description: ------------ In order to validate whether a given string is legitimate JSON, the documentation at: http://php.net/manual/en/function.json-decode.php suggests that we run it through json_decode() and then check that json_last_error() is JSON_ERROR_NONE. However, when the string is empty, json_last_error() is not set. The empty string is not syntactically valid as json. Test script: --------------- $checkme = ''; json_decode($checkme); if (json_last_error() === JSON_ERROR_NONE){ echo "OK"; }else{ echo "FAIL"; } #This should result in "FAIL", #but it gives "OK", wrongly imho. Expected result: ---------------- json_decode(''); should set json_last_error(). Actual result: -------------- [Note: this seems to be very similar to the same issue in bugs 54484 and 68938, both of which were fixed and closed on the PHP 5 series] -- Edit bug report at https://bugs.php.net/bug.php?id=75746&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75746&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75746&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75746&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75746&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75746&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75746&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75746&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75746&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75746&r=support Expected behavior: https://bugs.php.net/fix.php?id=75746&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75746&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75746&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75746&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75746&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75746&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75746&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75746&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75746&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75746&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75746&r=mysqlcfg