GC 3.0.8, PHP 8.1, CI4: n-to-n select fields content is not visible in edit form

Hello @johnny ,

It works pretty with PHP 7.4, but don’t works with PHP 8.1:
the two fields

$crud->setRelationNtoN(
            'suppliers',
            'product_suppliers',
            'suppliers',
            'product_id',
            'supplier_id',
            '{n_1} {lf_nr}-{connection_id}'
        );
$crud->setRelationNtoN(
            'groups',
            'product_groups',
            'groups',
            'product_id',
            'group_id',
            '{bez} {wa_grp}-{connection_id}'
        );

are populated on product create with supplier_id and group_id (the user see in the select field supplier name and group name).
After save if I call the view form for the product, I can see the saved supplier and group (with both PHP 7.4 and 8.1 versions):

Bildschirmfoto vom 2023-06-26 14-48-26565×111 10.9 KB

Bildschirmfoto vom 2023-06-26 14-49-07704×112 6.03 KB

I can pick up the new supplier & group from select list, but it will overwrite the old saved data that I’m not able to see.

The edit form works perfect with PHP 7.4:

Bildschirmfoto vom 2023-06-26 14-47-53719×106 9.54 KB

How to fix? I need PHP 8.1 for another parts of my project…

Two Videos, the Bug can be reproduced any time:

1. PHP7.4 - all OK as expected, started with

./spark serve
CodeIgniter v4.3.4 Command Line Tool - Server Time: 2023-06-29 14:15:59 UTC+02:00
CodeIgniter development server started on http://localhost:8080
[Thu Jun 29 14:15:59 2023] PHP 7.4.33 Development Server (http://localhost:8080) started

2. PHP8.1- Problem, started with

./spark serve --php /usr/bin/php8.1
CodeIgniter v4.3.4 Command Line Tool - Server Time: 2023-06-29 14:36:56 UTC+02:00
CodeIgniter development server started on http://localhost:8080
[Thu Jun 29 14:36:56 2023] PHP 8.1.20 Development Server (http://localhost:8080) started`

The same behavior is on the production Server (Apache Webserver, PHP8.1 / PHP 7.4)

Hello @johnny,

I think I have found the cause of error.

It’s a JSON Response to front-end from $crud->render()

with PHP 7.4:
...,"suppliers":["74"],"groups":["5"],...

string indexes, names found and shown

with PHP 8.1:
...,"suppliers":[74],"groups":[5],...

integer indexes, names are not found

Can you fix this please?

Best regards
Ruslan

The Problem is in the different behavior of the json_encode()-function in PHP7.4 and PHP8.1.

If I change in EditFormState::render() (line 108) the

$render->output = json_encode($output);
to
$render->output = json_encode($output, JSON_NUMERIC_CHECK);

then the output seems equal in any PHP version, but front-end presentation of ALL select fields is wrong(empty).

Thank you @johnny, it works now as expected!