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Bug #75716 RecursiveArrayIterator does not traverse vars by reference
Submitted: 2017-12-21 16:08 UTC Modified: 2017-12-21 16:18 UTC
From: greg at girty dot net Assigned:
Status: Duplicate Package: SPL related
PHP Version: 7.1.12 OS: OSX, linux
Private report: No CVE-ID: None
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From: greg at girty dot net
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 [2017-12-21 16:08 UTC] greg at girty dot net
The expected behaviour of RecursiveArrayIterator is that only leaf nodes will be iterated, but if an array is contained by reference, it is not traversed, instead it is returned by next().

Explicit use of RecursiveIteratorIterator::LEAVES_ONLY has no affect.

Submitter has tested this in OSX and Debian Linux, others likely affected.
HHVM gives the expected result, see 

Test script:
function flatten(array $nestedArraysAndStrings){
    $iter = new RecursiveIteratorIterator(
        new RecursiveArrayIterator($nestedArraysAndStrings));
    foreach($iter as $leaf){ $flat[] = $leaf; }
    return join(NULL, $flat);

$noRefs = [[[['some']]],[' nested ']," items \n"];

$withRefs = []+$noRefs;
$wat = $noRefs[0];
$withRefs[0] = &$wat;

echo flatten($noRefs);
echo flatten($withRefs);

Expected result:
some nested  items n
Notice: Array to string conversion in /in/up3me on line 8
Array nested  items n

Actual result:
some nested  items 
some nested  items 


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 [2017-12-21 16:12 UTC] greg at girty dot net
-Status: Open +Status: Closed -Type: Bug +Type: Documentation Problem
 [2017-12-21 16:12 UTC] greg at girty dot net
mixed expected and actual results, closing and resubmitting a corrected version
 [2017-12-21 16:18 UTC]
-Status: Closed +Status: Duplicate -Type: Documentation Problem +Type: Bug
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