Pimcore\Model\Object\ClassDefinition\Data\MultihrefMetadata::setColumns PHP Method

    public function setColumns($columns)
    {
        if (isset($columns['key'])) {
            $columns = [$columns];
        }
        usort($columns, [$this, 'sort']);
        $this->columns = [];
        $this->columnKeys = [];
        foreach ($columns as $c) {
            $c['key'] = strtolower($c['key']);
            $this->columns[] = $c;
            $this->columnKeys[] = $c['key'];
        }
        return $this;
    }