AddLabels.php

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<?php
/* Copyright (c) 2017 Stefan Hecken <stefan.hecken@concepts-and-training.de> Extended GPL, see docs/LICENSE */
 
namespace ILIAS\Transformation\Transformations;
 
use ILIAS\Transformation\Transformation;
 
class AddLabels implements Transformation
{
    protected $labels;
 
    public function __construct(array $labels)
    {
        $this->labels = $labels;
    }
 
    public function transform($from)
    {
        if (!is_array($from)) {
            throw new \InvalidArgumentException(__METHOD__ . " argument is not an array.");
        }
 
        if (count($from) != count($this->labels)) {
            throw new \InvalidArgumentException(__METHOD__ . " number of items in arrays are not equal.");
        }
 
        return array_combine($this->labels, $from);
    }
 
    public function __invoke($from)
    {
        return $this->transform($from);
    }
}