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array_group_by helper function does not accept array of objects #10225
Description
PHP Version
8.4
CodeIgniter4 Version
4.7.2
CodeIgniter4 Installation Method
Composer (using codeigniter4/appstarter)
Which operating systems have you tested for this bug?
Windows
Which server did you use?
cli-server (PHP built-in webserver)
Environment
production, development
Database
No response
What happened?
I have an array of objects. Each object contains a property called group. I would like to generate a multi-dimensional array where the keys are the group name and the values are an array of each object that matches that key. My code is as follows:
helper('array');
$groupedArray = array_group_by($originalArray, [ 'group' ]);
I get the following error:
[TypeError]
CodeIgniter\Helpers\Array\ArrayHelper::arrayAttachIndexedValue(): Argument #2 ($row) must be of type array, stdClass given, called in C:\inetpub\wwwroot\ims\vendor\codeigniter4\framework\system\Helpers\Array\ArrayHelper.php on line 197
at SYSTEMPATH\Helpers\Array\ArrayHelper.php:209
Steps to Reproduce
helper('array');
$json = '[{ "id": 1, "name": "Giraffe", "group": "Mammals" }, { "id": 2, "name": "Zebra", "group": "Mammals" }, { "id": 3, "name": "Crow", "group": "Birds" }]';
$groupedArray = array_group_by(json_decode($json), [ 'group' ]);
print_r($groupedArray);
Expected Output
I expected to get the following output
Array
(
[Mammals] => Array
(
[0] => stdClass Object
(
[id] => 1
[name] => Giraffe
[group] => Mammals
)
[1] => stdClass Object
(
[id] => 2
[name] => Zebra
[group] => Mammals
)
)
[Birds] => Array
(
[0] => stdClass Object
(
[id] => 3
[name] => Crow
[group] => Birds
)
)
)
Anything else?
No response
Activity
[-]Bug: Bug: `array_group_by` helper function does not allow array of objects[/-][+]Bug: `array_group_by` helper function does not allow array of objects[/+][-]Bug: `array_group_by` helper function does not allow array of objects[/-][+]Bug: `array_group_by` helper function does not accept array of objects[/+]michalsn commentedon May 21, 2026
This is not a bug.
array_group_by()is designed to work with arrays of arrays, and object rows are not supported at the moment. Supporting arrays of objects would be an enhancement/feature request.[-]Bug: `array_group_by` helper function does not accept array of objects[/-][+]`array_group_by` helper function does not accept array of objects[/+]refactor: scope object support to dot_array_search and array_group_by
michalsn commentedon Jun 13, 2026
Resolved via #10296