Description:
------------
http://www.php.net/manual/en/arrayaccess.offsetget.php

"While direct modification triggers a call to ArrayAccess::offsetSet(), indirect 
modification triggers a call to ArrayAccess::offsetGet(). In that case, the 
implementation of ArrayAccess::offsetGet() must be able to return by reference, 
otherwise an E_NOTICE message is raised.".

When &offsetGet() is implemented in a trait, this got broken in 5.4.11 with this 
commit:
https://github.com/php/php-src/commit/3f8c729e693c432b438cd33679182260d8732e30

The patch attached just comments out the check which causes the error. There 
should be a better way to deal with this problem.

Test script:
---------------
<?php
// This code is mostly the same as in the
// http://www.php.net/manual/en/class.arrayaccess.php example,
// but changed to use traits.

trait aa {
    private $container = array();
    public function offsetSet($offset, $value) {
        if (is_null($offset)) {
            $this->container[] = $value;
        } else {
            $this->container[$offset] = $value;
        }
    }
    public function offsetExists($offset) {
        return isset($this->container[$offset]);
    }
    public function offsetUnset($offset) {
        unset($this->container[$offset]);
    }
    public function &offsetGet($offset) {
	$result = null;
        if (isset($this->container[$offset])) {
            $result = &$this->container[$offset];
        }
        return $result;
    }
}

class obj implements ArrayAccess {
    use aa;
}

$o = new obj;
$o['x'] = 1;
++$o['x'];
echo $o['x'], "\n";

Expected result:
----------------
$ ./php-5.4.10/sapi/cli/php OffsetGet.php 

2


Actual result:
--------------
$ ./php5.4-201303122030/sapi/cli/php OffsetGet.php 

Fatal error: Declaration of & aa::offsetGet($offset) must be compatible with 
ArrayAccess::offsetGet($offset) in /home/build/tmp/OffsetGet.php on line 28