src/Zicht/Bundle/PageBundle/Model/ContentItemMatrix.php
public function getTypes($region = null)
    {
        if (null === $region) {
            $ret = [];
            foreach ($this->matrix as $types) {
                $ret = array_merge($ret, $types);
            }

            return array_values(array_unique($ret));
        }

        return $this->matrix[$region];
    }
public function getTypes($region = null)
    {
        if (null === $region) {
            $ret = [];
            foreach ($this->matrix as $types) {
                $ret = array_merge($ret, $types);
            }

            return array_values(array_unique($ret));
        }

        return $this->matrix[$region];
    }
Returns the available types for a specified region.
If not specified, returns all types configured.

@param string $region

@return array