Edit report at https://bugs.php.net/bug.php?id=64417&edit=1
ID: 64417
Updated by: larue...@php.net
Reported by: me at fixxxer dot me
Summary: BC break: ArrayAccess::&offsetGet() in a trait
causes fatal error.
Status: Open
Type: Bug
Package: Scripting Engine problem
Operating System: any
PHP Version: 5.4Git-2013-03-12 (snap)
-Assigned To:
+Assigned To: dmitry
Block user comment: N
Private report: N
New Comment:
dmitry, please look at this one.
Previous Comments:
------------------------------------------------------------------------
[2013-03-12 22:39:06] me at fixxxer dot me
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
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=64417&edit=1
