code: public function attachFile(string $sFileName, string $sContent, string $sType) : bool
  	{
  		$this->_aAttachments[] = array(
  			"name" => $sFileName,
  			"content" => $sContent,
  			"type" => $sType
  		);
  		
  		return true;
  	}
docs: add a file to the mail
  
  @access public private
  @param  string $sFileName
  @param  string $sContent
  @param  string $sType
  @return bool