Req #60107 [NEW]: Allow subtype polymorphism in interfaces

From: Date: Fri, 21 Oct 2011 11:59:17 +0000
Subject: Req #60107 [NEW]: Allow subtype polymorphism in interfaces
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-164491@lists.php.net to get a copy of this message 
From:             
Operating system: All
PHP version:      5.3.8
Package:          Unknown/Other Function
Bug Type:         Feature/Change Request
Bug description:Allow subtype polymorphism in interfaces

Description:
------------
Please allow for subtype polymorphism/downcasting in interfaces. 

Test script:
---------------
interface Deliverable {}

interface DeliverableWithTruck extends Deliverable {}

interface DeliveryService {
    function deliver( Deliverable $deliverable, $destination );
}


class CookieJar implements DeliverableWithTruck {}

class ExpressDeliveryService implements DeliveryService {

    function deliver( DeliverableWithTruck $deliverable, $destination ) {
        echo "Delivery underway";
    }

}


$fedEx = new ExpressDeliveryService;
$chocolateChipCookies = new CookieJar;

$fedEx->deliver( $chocolateChipCookies, "Sesame Street" );


Expected result:
----------------
Delivery underway

Actual result:
--------------
Fatal error: Declaration of ExpressDeliveryService::deliver() must be
compatible 
with that of DeliveryService::deliver()

-- 
Edit bug report at https://bugs.php.net/bug.php?id=60107&edit=1
-- 
Try a snapshot (PHP 5.4):            https://bugs.php.net/fix.php?id=60107&r=trysnapshot54
Try a snapshot (PHP 5.3):            https://bugs.php.net/fix.php?id=60107&r=trysnapshot53
Try a snapshot (trunk):              https://bugs.php.net/fix.php?id=60107&r=trysnapshottrunk
Fixed in SVN:                        https://bugs.php.net/fix.php?id=60107&r=fixed
Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=60107&r=needdocs
Fixed in release:                    https://bugs.php.net/fix.php?id=60107&r=alreadyfixed
Need backtrace:                      https://bugs.php.net/fix.php?id=60107&r=needtrace
Need Reproduce Script:               https://bugs.php.net/fix.php?id=60107&r=needscript
Try newer version:                   https://bugs.php.net/fix.php?id=60107&r=oldversion
Not developer issue:                 https://bugs.php.net/fix.php?id=60107&r=support
Expected behavior:                   https://bugs.php.net/fix.php?id=60107&r=notwrong
Not enough info:                     https://bugs.php.net/fix.php?id=60107&r=notenoughinfo
Submitted twice:                     https://bugs.php.net/fix.php?id=60107&r=submittedtwice
register_globals:                    https://bugs.php.net/fix.php?id=60107&r=globals
PHP 4 support discontinued:          https://bugs.php.net/fix.php?id=60107&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=60107&r=dst
IIS Stability:                       https://bugs.php.net/fix.php?id=60107&r=isapi
Install GNU Sed:                     https://bugs.php.net/fix.php?id=60107&r=gnused
Floating point limitations:          https://bugs.php.net/fix.php?id=60107&r=float
No Zend Extensions:                  https://bugs.php.net/fix.php?id=60107&r=nozend
MySQL Configuration Error:           https://bugs.php.net/fix.php?id=60107&r=mysqlcfg

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