Bug #72132 [NEW]: isset() sometimes returns FALSE when TRUE is expected

From: holger dot schletz at web dot de Operating system: Arch Linux, Kernel 4.5.1-1-ARCH PHP version: 7.0.6 Package: Arrays related Bug Type: Bug Bug description:isset() sometimes returns FALSE when TRUE is expected Description: ------------ This seems to be a regression with PHP 7.0.6. The problem does not occur when I downgrade to 7.0.5. The problem is difficult to reproduce. The test script below will most likely behave correctly, but in some very specific context, a similar case will fail, and the failure is reproducible then. Test script: --------------- $var['a']['b'] = 'c'; var_dump($var['a']['b']); var_dump(isset($var['a']['b'])); Expected result: ---------------- string(1) "c" bool(true) Actual result: -------------- string(1) "c" bool(false) -- Edit bug report at https://bugs.php.net/bug.php?id=72132&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72132&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72132&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72132&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72132&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72132&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72132&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72132&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72132&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72132&r=support Expected behavior: https://bugs.php.net/fix.php?id=72132&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72132&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72132&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72132&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72132&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72132&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72132&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72132&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72132&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72132&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72132&r=mysqlcfg