Chaining.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\UI\Help\TextRetriever;
 
use ILIAS\UI\HelpTextRetriever;
use ILIAS\UI\Help;
 
class Chaining implements HelpTextRetriever
{
    protected array $retrievers;
 
    public function __construct(
        HelpTextRetriever ...$retrievers
    ) {
        $this->retrievers = $retrievers;
    }
 
    public function getHelpText(Help\Purpose $purpose, Help\Topic ...$topics): array
    {
        return array_unique(
            array_merge(
                ...array_map(
                    fn ($r) => $r->getHelpText($purpose, ...$topics),
                    $this->retrievers
                )
            )
        );
    }
}