Bug #80066 [NEW]: List Reference Assignment: Cannot reference an array value by return
From: php-0919 at jan-runte dot de
Operating system: macOS 10.15.6
PHP version: 7.3.22
Package: Variables related
Bug Type: Bug
Bug description:List Reference Assignment: Cannot reference an array value by return
Description:
------------
Feature 7.3 - List Reference Assignment:
- https://wiki.php.net/rfc/list_reference_assignment
When attempting to transfer an array return value via the list reference
assignment to certain keys with by-reference, the error "Attempting to
set reference to non referenceable value" occurs.
But the belonging value of that key is a referenceable value - it is an
array.
7.3.13: failed
7.3.22: failed
7.4.3: failed
7.4.10: failed
8.0.0beta2: failed
8.0.0beta3: failed
Test script:
---------------
function returnsArrayWithReferencedValue(array &$subject) : array {
return [
'a' => &$subject,
'b' => 123,
];
}
$source = [
'c' => [],
];
/*****************
/* PREFERRED WAY *
*****************/
['a' => &$referencedArray] = returnsArrayWithReferencedValue($source);
// Throws an error: "Attempting to set reference to non referenceable
value in ..."
/**************
/* WORKAROUND *
**************/
// First set returned array to a variable
$returnedArray = returnsArrayWithReferencedValue($source);
$source['d'] = 456; // manipulate source array
var_dump($returnedArray['a']);
/**********
/* MOCKUP *
**********/
// Fake returned array as a prepared variable
$fakeReturnedArray = [
'a' => &$source,
'b' => 123,
];
['a' => &$referencedArray] = $fakeReturnedArray;
$source['d'] = 456; // manipulate source array
var_dump($referencedArray);
Expected result:
----------------
array(2) {
["c"]=>
array(0) {
}
["d"]=>
int(456)
}
Actual result:
--------------
Throws an error: Attempting to set reference to non referenceable value
--
Edit bug report at https://bugs.php.net/bug.php?id=80066&edit=1
--
Fix committed: https://bugs.php.net/fix.php?id=80066&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=80066&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=80066&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=80066&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=80066&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=80066&r=support
Expected behavior: https://bugs.php.net/fix.php?id=80066&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=80066&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=80066&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=80066&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=80066&r=phptooold
Daylight Savings: https://bugs.php.net/fix.php?id=80066&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=80066&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=80066&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=80066&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=80066&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=80066&r=mysqlcfg
Thread (3 messages)
- php-0919 at jan-runte dot de