DossierItem LinkedTo based on list of array of external ids

helper.php

<?php
    /**
     * @param array $ids
     *
     * @return array
     */
    private function getLinkedToInfoByArrayOfIds($ids) {
        if(empty($ids)) {
            return [];
        }
        $group = [
            'person'       => 'relation',
            'organization' => 'relation',
            'project'      => 'project',
            'sales'        => 'sales',
        ];

        $linkedTo = [
            'person'       => 'person_id',
            'organization' => 'organization_id',
            'project'      => 'project_id',
            'sales'        => 'sales_id',
        ];

        // Group them by their matched grouping. [ 'person:abc', 'org:abc' => ['relation' => ['person:abc', 'org:abc'] ]
        foreach($ids as $externalId) {
            $explode = explode(':', $externalId);
            if(!isset($groupedData[$group[$explode[0]]])) {
                $groupedData[$group[$explode[0]]] = [];
            }
            $groupedData[$group[$explode[0]]][] = $externalId;
        }

        // Get the highest count of groupedData (['relation' => ['person:abc', 'org:abc'], 'project' => ['project:abc']] returns 2
        $max = count(max($groupedData));

        // Loop the maximum times of occurences, then assign items to each array, and unset them for the next loop
        $return = [];
        for($i = 0; $i < $max; $i++) {
            foreach($groupedData as $type => &$items) {
                if(isset($items[$i])) {
                    $explode = explode(':', $items[$i]);
                    $key = $linkedTo[$explode[0]]; // Resolve person:abc to ['person_id' => 'person:abc']
                    $return[$i][$key] = $items[$i];
                    unset($items[$i]);
                }
            }
        }

        return $return;
    }