[shka]

Ok, my mistake. It seems that vB5 doesn't have a plugin/hook system like vB4. The hooks you see are template hooks, you need php hooks.

For my addons I use only api extensions
Simple example:
- create in /forum/core/packages a subdir /testimportarray/api
- create a file arr.php

PHP Code:

<?php

if (!defined('VB_ENTRY')) {
    die('Access denied.');
}

class TestImportArray_Api_Arr extends vB_Api_Extensions
{
    public $product = 'testimportarray';
    public $developer = 'testdev';
    public $minver = '5.0.0';
    public $maxver = '6.0.0 Alpha 1';
    public $infourl = '';
    public $checkurl = '';
    public $AutoInstall = 1;
    public $title = 'TestImportArray';
    public $version = '1.0.0';

    public $extensionOrder = 5;

    public static function getArray($prevResult)
    {
        return [1,2,3,4];
    }
}

The subdir name /testimportarray has to be the same as in class TestImportArray_Api_Arr and public $product = 'testimportarray';
The subsubdir name /api is repeated in class TestImportArray_Api_Arr
The filename arr.php has to be the same like in class TestImportArray_Api_Arr

Then check in AdminCP/Add-ons & Hooks/Api Extensions and PHP Hooks if your Api is listed without error

Add-on: testimportarray
TestImportArray  (1.0.0) 	TestImportArray_Api_Arr 	Ja 	5.0.0 	6.0.0 Alpha 1 	Ja 	5

Then you can use the api function getArray in each template

PHP Code:

{vb:data userIds, arr, getArray}
{vb:debugvardump $userIds}