code: public static PHPDriverHelper getInstance() throws IOException {
  		if (_instance == null) {
  			_instance = new PHPDriverHelper();
  			_instance.interpretor = createTmpPhpFile("/interpretor.php");
  			_instance.phpExec = null;
  		}
  		return _instance;
  	}
docs: <p>getInstance.</p>
  
  @return a {@link com.greenpepper.phpsud.phpDriver.PHPDriverHelper} object.
  @throws java.io.IOException if any.