Bug #66689 [NEW]: Referencing the CLASS constant from an object results in a syntax error

From: ramsey Operating system: Ubuntu 12.04.3 LTS PHP version: 5.5.9 Package: Class/Object related Bug Type: Bug Bug description:Referencing the CLASS constant from an object results in a syntax error Description: ------------ The "Class Name Resolution As Scalar Via 'class' Keyword" RFC (https://wiki.php.net/rfc/class_name_scalars) introduced the new "class" alias that may be used to get the fully-qualified name of a class. It does not specify how this alias may be used from the context of an instance variable, but since it looks like a class constant, one assumes that it should be treated like a class constant. In the given test script, the BAZ constant may be accessed from the class name as Bar::BAZ or from the instance variable as $f::BAZ. Likewise, the "class" alias may be accessed as Bar::CLASS, but it results in a syntax error when attempting to access it from the instance variable as $f::CLASS. The solution is to use get_class($f), but I consider this a bug. Since the "class" alias looks like a built-in class constant, it makes sense to treat like a full class constant and access it from an instance variable. Test script: --------------- <?php namespace Foo; class Bar { const BAZ = 'hello'; } $f = new Bar; var_dump(Bar::CLASS); // dumps "Foo\Bar" var_dump($f::BAZ); // dumps "hello" var_dump($f::CLASS); // Results in syntax error Expected result: ---------------- string(7) "Foo\Bar" string(5) "hello" string(7) "Foo\Bar" Actual result: -------------- PHP Parse error: syntax error, unexpected 'CLASS' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /home/ramsey/test.php on line 14 -- Edit bug report at https://bugs.php.net/bug.php?id=66689&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=66689&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=66689&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=66689&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=66689&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=66689&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=66689&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=66689&r=needscript Try newer version: https://bugs.php.net/fix.php?id=66689&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=66689&r=support Expected behavior: https://bugs.php.net/fix.php?id=66689&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=66689&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=66689&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=66689&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=66689&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=66689&r=dst IIS Stability: https://bugs.php.net/fix.php?id=66689&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=66689&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=66689&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=66689&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=66689&r=mysqlcfg