Bug #70514 [NEW]: isset(aClass::ARRAY[$a]) is mistaken for an expression

From: dams Operating system: OSX, Debian PHP version: 7.0.0RC2 Package: Class/Object related Bug Type: Bug Bug description:isset(aClass::ARRAY[$a]) is mistaken for an expression Description: ------------ Since PHP 5.6, constants may be arrays (class or global constants). However, isset() recognize them as 'expressions' and produces a fatal error. if (isset(aClass::X[$a])) if (isset(X[$a])) On the other hand, PHP accepts : if (isset(aClass::$X[$a])) The behavior is in PHP 5.6 till PHP 7.0RC2 (and I tried PHP 7.1.0-dev this afternoon). Test script: --------------- <?php class W { const X = [1 => 2, 3 => 4]; public function f() { $a = 5; if (isset(static::X[$a])) { print "$a exists\n"; } else { print "$a doesn't exists\n"; } } } $x = new X; $x->f(); Expected result: ---------------- if (isset(aClass::X[$a])) if (isset(X[$a])) works just like if (isset(aClass::$X[$a])) Actual result: -------------- The error : PHP Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /Users/famille/Desktop/analyze/test.php on line 9 Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /Users/famille/Desktop/analyze/test.php on line 9 -- Edit bug report at https://bugs.php.net/bug.php?id=70514&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70514&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70514&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70514&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70514&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70514&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70514&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70514&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70514&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70514&r=support Expected behavior: https://bugs.php.net/fix.php?id=70514&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70514&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70514&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70514&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70514&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70514&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70514&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70514&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70514&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70514&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70514&r=mysqlcfg