code: public function sections($key=null, $template=null)
  	{
  		if (!array_filter($this->sections))
  		{
  			return;
  		}
  
  		// The key does not match
  		if ($key && !isset($this->positions[$key]))
  		{
  			return;
  		}
  
  		$matches = array();
  
  		foreach ($this->positions[$key] as $id=>$section)
  		{
  			if (!empty($this->sections[$id]))
  			{
  				$section['content'] = $this->sections[$id];
  				$matches[$id] = $section;
  			}
  		}
  
  		// Return if the section is empty (see #1115)
  		if (empty($matches))
  		{
  			return;
  		}
  
  		$this->matches = $matches;
  
  		if ($template === null)
  		{
  			$template = 'block_sections';
  		}
  
  		include $this->getTemplate($template);
  	}
docs: Return the custom layout sections
  
  @param string $key      An optional section name
  @param string $template An optional template name