[PHP-BUG] Req #51544 [NEW]: instanceof for static calls

From:             
Operating system: Windows XP
PHP version:      5.3.2
Package:          Reflection related
Bug Type:         Feature/Change Request
Bug description:instanceof for static calls

Description:
------------
Hy guys,

Here's a problem i faced today : i wanted to know if a base and derived
class having only static functions and using both late static binding were
an implementation of a specific interface. 
The problem was that the class base needed to know if its child implemented
a specific interface.
Not easy to explain, the code is easier for a better comprehension :



Test script:
---------------
<?php

interface iTest { }

class base {
  public static function create() {
    if (self instanceof iTest) echo 'iTest';
  }
}

class child extends base implements iTest { }

child::create();

?>

Expected result:
----------------
Normally the result should be 'iTest' because the class 'child' implements
iTest

Actual result:
--------------
Doesn't execute.

Here's the solution i found : i used the ReflectionCLass to emulate that
feature

<?php

interface iTest { }

class base {

  public static function create() {
    $r = new ReflectionClass(static::$SELF);
    if (in_array('iTest', $r->getInterfaceNames())) echo 'iTest';
  }	
}

class child extends base implements iTest { 	
  protected static $SELF = __CLASS__;
}

child::create();

?>

-- 
Edit bug report at http://bugs.php.net/bug.php?id=51544&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=51544&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=51544&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=51544&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=51544&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51544&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=51544&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=51544&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=51544&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=51544&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=51544&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=51544&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=51544&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=51544&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=51544&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=51544&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=51544&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=51544&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=51544&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=51544&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=51544&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=51544&r=mysqlcfg