Pimcore\Model\Object\ClassDefinition\Data\StructuredTable::setCols PHP Method

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