Bug #73152 [NEW]: Hint of return type in PHP works unexpected way.

From: Date: Fri, 23 Sep 2016 16:02:52 +0000
Subject: Bug #73152 [NEW]: Hint of return type in PHP works unexpected way.
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-204211@lists.php.net to get a copy of this message 
From:             roman at litgroup dot ru
Operating system: Linux
PHP version:      7.0.11
Package:          *General Issues
Bug Type:         Bug
Bug description:Hint of return type in PHP works unexpected way.

Description:
------------
Hint of return type in PHP works unexpected way.
It's not possible to change hint of return type to a more concrete
subtype.

Test script:
---------------
interface Person {/* _ */}

interface PersonFactory
{
    public function createPerson(): Person;
}

class Customer implements Person {/* _ */}

class CustomerFactory implements PersonFactory
{
    public function createPerson(): Customer // PHP Fatal error:
    {                                        // Declaration of
CustomerFactory::createPerson(): Customer
        return new Customer();               // must be compatible with
PersonFactory::createPerson(): Person
    }
}


-- 
Edit bug report at https://bugs.php.net/bug.php?id=73152&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=73152&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=73152&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=73152&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=73152&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=73152&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=73152&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=73152&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=73152&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=73152&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=73152&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=73152&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=73152&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=73152&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73152&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=73152&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=73152&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=73152&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=73152&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=73152&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=73152&r=mysqlcfg

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