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Request #30716 Dynamic Static Member Access
Submitted: 2004-11-08 05:59 UTC Modified: 2010-12-22 03:23 UTC
Votes:17
Avg. Score:4.8 ± 0.5
Reproduced:16 of 16 (100.0%)
Same Version:6 (37.5%)
Same OS:8 (50.0%)
From: jake at development dot mindvision dot com dot au Assigned: johannes (profile)
Status: Closed Package: *General Issues
PHP Version: 5.0.1 OS: Gentoo Linux (2.4.x)
Private report: No CVE-ID: None
View Add Comment Developer Edit
 [2004-11-08 05:59 UTC] jake at development dot mindvision dot com dot au 
Description:
------------
Hello,

I feel i have a syntax bug or unclear syntax limitation.

I am trying to access static members of classes, dynamically
ie $foo = 'className'; echo $foo::$staticVariable;


For more information please see my posts on the php-generals list
 - http://news.php.net/php.general/201458

Thanks in advance

Yours Sincerely
Jake Press

Reproduce code:
---------------
<?php
      // Define a class with a nice juicy static variable
   class bob {
   public static $type = 'safd';
   }
      // Lets chuck the name of the class into a variable...
   $foo = 'bob';
      // Just to show it all works lets do it manualllllly
   echo bob::$type;
      // This is the line with the well-wicked parse error on the double colon
   echo $foo::$type;
?>

Expected result:
----------------
safdsafd

Actual result:
--------------
Parse error: parse error, unexpected T_PAAMAYIM_NEKUDOTAYIM, expecting ',' or ';' in /mnt/data0/www/twd/test.php on line 15

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History

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 [2004-11-09 09:27 UTC] k at ailis dot de 
Just for info: The problem is also present in latest CVS. And even if it is not a bug it's still a useful feature request.
 [2004-11-11 09:22 UTC] joscha at feth dot com 
After I found out, that my note (http://news.php.net/php.notes/78312) was deleted, which I thought was not a good idea, because it is the only way to make a static function call to a "unknown" class, I wrote a Mail to the guy who deleted it. After a few mails we decided that the code I wrote in the note:
print_r(eval("return $classname::getBla();"));
is completely correct and working. So I resubmitted my note, but I also think it'd be better to allow $classname::getBla(); out-of-the-box as the eval call is always a performance killer and it restricts the use of the code above to examples where no user-input is in $classname.
 [2004-11-11 09:54 UTC] tony2001@php.net 
use call_user_func() for that.
 [2005-12-21 00:23 UTC] jake at press dot id dot au 
Heyas

I havent got a copy of php infront of me, and it has been many months since i last poked around on this issue - so apologies if i am wrong... But i dont beleive "call_user_func()" is the solution.

... we are trying too access a static member dynamically, not a static method.

Such a pity, i have been successfully using a workaround along the same lines as suggested by joscha at feth dot com for along time now, i was hoping i could go thru and fix all of my code that is dependant on it by now :(

I'll try and find some time too investigate this further and attempt to fix - but i fear that will be closer to this time next year.



Jake Press
 [2007-10-05 01:45 UTC] itisben at gmail dot com 
Hi,
   In case anyone is still beating their head against the wall -or- doesn't want to use eval -or- isn't sure whether or not 5.2.4 fixed this in addition to the dynamic static method call that was supposed to be fixed in that version - http://bugs.php.net/bug.php?id=31318 (I can't get it to work after moving to that version, unless the little note at the bottom means that it is 5.3).

   Anway, here it is - it requires PHP >=5 for the Reflection 
<?php
...
$refClass = new ReflectionClass($className);
$staticMemVal = $refClass->getStaticPropertyValue($staticMemName);
...
?>

Hopefully the variable names are descriptive enough to get the general idea.

Thanks,
Ben
 [2010-12-22 03:23 UTC] johannes@php.net
-Status: Open +Status: Closed -Package: Feature/Change Request +Package: *General Issues -Assigned To: +Assigned To: johannes
 [2010-12-22 03:23 UTC] johannes@php.net 
"Dynamic static calls" were added in PHP 5.3.0
 
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