Doc #77321 [Nab]: array_filter combined with references

Edit report at https://bugs.php.net/bug.php?id=77321&edit=1 ID: 77321 Updated by: cmb@php.net Reported by: php at kingsquare dot nl Summary: array_filter combined with references Status: Not a bug Type: Documentation Problem Package: Arrays related PHP Version: 7.0.0 Block user comment: N Private report: N New Comment: Shouldn't we trigger a notice/warning, if we ignore a call-by-ref declaration? Previous Comments: ------------------------------------------------------------------------ [2018-12-20 16:56:55] requinix@php.net array_filter never supported by-ref values. The fact that it worked in PHP 5 was a bug, and it was fixed in PHP 7 when much of the engine changed. ------------------------------------------------------------------------ [2018-12-20 09:06:12] php at kingsquare dot nl Description: ------------ This is probably on purpose, but there is an undocumented backwards compatibility issue betwee PHP5 and PHP7. I know this might be a bit late to the party, but still. It involves the differnce in using array_filter and references. Test script: --------------- <?php // also see https://3v4l.org/Z2HnL $input = [1, 2]; var_dump(array_filter($input, function(& $value) { if ($value % 2 === 0) { return false; } $value++; return true; })); Expected result: ---------------- As the changelog doesn't seem to mention anything related to this I would expect them to be the same result [(int)2]. Actual result: -------------- PHP5: [2] PHP7: [1] ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77321&edit=1