src/Zicht/Bundle/PageBundle/Model/ContentItemMatrix.php
public function removeRegion($region)
    {
        if (array_key_exists($region, $this->matrix)) {
            unset($this->matrix[$region]);
        }

        return $this;
    }
public function removeRegion($region)
    {
        if (array_key_exists($region, $this->matrix)) {
            unset($this->matrix[$region]);
        }

        return $this;
    }
Remove a region

@param string $region

@return $this