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Wild guess as to what you want to achieve:

Rather that $row, viewforum.php holds all forum data in the $forum_data array. Change all $rows in your code to $forum_data, i.e. $row['forum_image'] becomes $forum_data['forum_image'].

Go to ACP, General, Search settings. Set Search backend to phpBB Native Fulltext, if it isn't already. Set Min characters indexed by search to 2. Go to ACP, Maintenance, Search index. Delete the phpBB Native Fulltext index, if it exists, and re-create it. This can take a while, depending on how many...

The server doesn't know from which page the request is coming from, that's why you're seeing wrong relative paths. Set the _referer field of your AJAX request data to the current page you're on and send it along with your other data to the server. phpBB will automatically use it to determine the cor...

In your migration, use the parent module's language variable as second argument to the module.add call. In your example for the Top Five category, it would be TF_ACP : ['module.add', [ 'acp', 'TF_ACP', [ 'module_basename' => '\maxrpg\extname\acp\main_module', 'modes' => ['some_mode'], ], ]],

I'm not sure what your old method is, but $value = $this->config['key']; and $this->config->set('key', 'value'); is how the config service is supposed to be used.