Bug #60217 [NEW]: imposing requirements in traits

From: Date: Fri, 04 Nov 2011 13:12:06 +0000
Subject: Bug #60217 [NEW]: imposing requirements in traits
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-164878@lists.php.net to get a copy of this message 
From:             
Operating system: Ubuntu Linux 11.10
PHP version:      5.4.0beta2
Package:          Class/Object related
Bug Type:         Bug
Bug description:imposing requirements in traits

Description:
------------
Using multiple traits that depend on the same requirement using an abstract
method fails with a fatal error.
I tried using trait composition in order to move the requirement into a
common trait, but this does not work either.



Test script:
---------------
trait DoubleAmount {
    public function doubleAmount() {
        return $this->getAmount() * 2;
    }
    public abstract function getAmount();
}
trait TripleAmount {
    public function tripleAmount() {
        return $this->getAmount() * 3;
    }
    public abstract function getAmount();
}
class model {
    use DoubleAmount, TripleAmount;

    public function getAmount() {
        return 23;
    }
}

Actual result:
--------------
PHP Fatal error:  Can't inherit abstract function TripleAmount::getAmount()
(previously declared abstract in DoubleAmount) in
/home/maus/projects/traitstest/trait_abstract.php on line 30

-- 
Edit bug report at https://bugs.php.net/bug.php?id=60217&edit=1
-- 
Try a snapshot (PHP 5.4):            https://bugs.php.net/fix.php?id=60217&r=trysnapshot54
Try a snapshot (PHP 5.3):            https://bugs.php.net/fix.php?id=60217&r=trysnapshot53
Try a snapshot (trunk):              https://bugs.php.net/fix.php?id=60217&r=trysnapshottrunk
Fixed in SVN:                        https://bugs.php.net/fix.php?id=60217&r=fixed
Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=60217&r=needdocs
Fixed in release:                    https://bugs.php.net/fix.php?id=60217&r=alreadyfixed
Need backtrace:                      https://bugs.php.net/fix.php?id=60217&r=needtrace
Need Reproduce Script:               https://bugs.php.net/fix.php?id=60217&r=needscript
Try newer version:                   https://bugs.php.net/fix.php?id=60217&r=oldversion
Not developer issue:                 https://bugs.php.net/fix.php?id=60217&r=support
Expected behavior:                   https://bugs.php.net/fix.php?id=60217&r=notwrong
Not enough info:                     https://bugs.php.net/fix.php?id=60217&r=notenoughinfo
Submitted twice:                     https://bugs.php.net/fix.php?id=60217&r=submittedtwice
register_globals:                    https://bugs.php.net/fix.php?id=60217&r=globals
PHP 4 support discontinued:          https://bugs.php.net/fix.php?id=60217&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=60217&r=dst
IIS Stability:                       https://bugs.php.net/fix.php?id=60217&r=isapi
Install GNU Sed:                     https://bugs.php.net/fix.php?id=60217&r=gnused
Floating point limitations:          https://bugs.php.net/fix.php?id=60217&r=float
No Zend Extensions:                  https://bugs.php.net/fix.php?id=60217&r=nozend
MySQL Configuration Error:           https://bugs.php.net/fix.php?id=60217&r=mysqlcfg

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