code: public static function optionSelected($strOption, $varValues)
  	{
  		if ($strOption === '')
  		{
  			return '';
  		}
  
  		return (\is_array($varValues) ? \in_array($strOption, $varValues) : $strOption == $varValues) ? ' selected' : '';
  	}
docs: Return a "selected" attribute if the option is selected
  
  @param string $strOption The option to check
  @param mixed  $varValues One or more values to check against
  
  @return string The attribute or an empty string