Doc #64847 [NEW]: It appears that traits may define static member variables

From: mhorowitz at etsy dot com Operating system: linux PHP version: 5.4.15 Package: Documentation problem Bug Type: Documentation Problem Bug description:It appears that traits may define static member variables Description: ------------ Try it -- put a static variable in a trait declaration, then access that variable in code defined in the trait and/or defined in the "exhibiting" class. It works just fine. I spoke with Rasmus; we both believe this is fine behavior and that the documentation (quoted below) should be changed to make it clear that one can, in fact, declare a static variable within the trait definition. Quote from: http://php.net/manual/en/language.oop5.traits.php "Static variables can be referred to in trait methods, but cannot be defined by the trait." Test script: --------------- <?php // So, the following works and, for my purposes, is really, really useful. trait TTrait { protected static $instance = 'hello there'; public function publicFn() { echo self::$instance . "\n"; echo "publicFn\n"; } } class Foo { use TTrait; public function tryMe() { echo "From Foo: "; $this->publicFn(); echo "In tryMe -- instance is: " . self::$instance . "\n"; } } $f = new Foo(); $f->tryMe(); Expected result: ---------------- As noted, please adjust the doc to reflect that static variable declarations are actually allowed. Currently, name collisions are handled as is done for non- static properties (i.e. E_STRICT error, as per the doc for properties). In the future, it might be nice if the renaming clause would work for static variables too. -- Edit bug report at https://bugs.php.net/bug.php?id=64847&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=64847&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=64847&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=64847&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=64847&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=64847&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=64847&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=64847&r=needscript Try newer version: https://bugs.php.net/fix.php?id=64847&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=64847&r=support Expected behavior: https://bugs.php.net/fix.php?id=64847&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=64847&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=64847&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=64847&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64847&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=64847&r=dst IIS Stability: https://bugs.php.net/fix.php?id=64847&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=64847&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=64847&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=64847&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=64847&r=mysqlcfg