Bug #76587 [Opn->Ana]: array_column gives incorrect result if $indexKey selects a float

Edit report at https://bugs.php.net/bug.php?id=76587&edit=1 ID: 76587 Updated by: cmb@php.net Reported by: rowan dot collins at gmail dot com Summary: array_column gives incorrect result if $indexKey selects a float -Status: Open +Status: Analyzed Type: Bug Package: Arrays related PHP Version: 7.2.7 Block user comment: N Private report: N New Comment: I can confirm the described behavior: <https://3v4l.org/Yvaup>. However, I'm not sure that qualifies as bug, since the docs[1] state: | This value may be the integer key of the column, or it may be | the string key name. Anyhow, if we would change the current behavior (BC break!), we 'd had to adapt this code[2] (cast FLOAT to INT), or perhaps even treat the $column_key parameter in the same way and adapt array_column_fetch_prop()[3]. [1] <http://php.net/manual/en/function.array-column.php> [2] <https://github.com/php/php-src/blob/af341213f73650b28b74b374501d84060eb604ab/ext/standard/array.c#L4177-L4182> [3] <https://github.com/php/php-src/blob/af341213f73650b28b74b374501d84060eb604ab/ext/standard/array.c#L4111-L4115> Previous Comments: ------------------------------------------------------------------------ [2018-07-06 13:14:42] rowan dot collins at gmail dot com Description: ------------ When array_column is used with the $indexKey parameter, and the selected index is a float, it is ignored, and treated as an array-append operation. This is unexpected, because attempting to use a float as a key would normally result in it being cast to either an integer or a string. Note that this is similar to Bug #68553, where null keys are also treated as array-appends. As with that bug, the polyfill implemented in userland behaves as expected. HHVM's implementation seems to cast all floats to integer, so float(2.5) becomes int(2) rather than string("2.5"). Test script: --------------- $a = [ [ 'foo' => 1.0 ], [ 'foo' => 2.5 ], [ 'foo' => 3 ], [ 'foo' => '4' ], ]; var_dump(array_column($a, 'foo', 'foo')); Expected result: ---------------- array(4) { [1] => float(1) ["2.5"] => float(2.5) [3] => int(3) [4] => string(1) "4" } Actual result: -------------- array(4) { [0] => float(1) [1] => float(2.5) [3] => int(3) [4] => string(1) "4" } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76587&edit=1