code: public static function cleanKey($varValue)
  	{
  		// Recursively clean arrays
  		if (\is_array($varValue))
  		{
  			$return = array();
  
  			foreach ($varValue as $k=>$v)
  			{
  				$k = static::cleanKey($k);
  
  				if (\is_array($v))
  				{
  					$v = static::cleanKey($v);
  				}
  
  				$return[$k] = $v;
  			}
  
  			return $return;
  		}
  
  		$varValue = static::decodeEntities($varValue);
  		$varValue = static::xssClean($varValue, true);
  		$varValue = static::stripTags($varValue);
  
  		return $varValue;
  	}
docs: Sanitize the variable names (thanks to Andreas Schempp)
  
  @param mixed $varValue A variable name or an array of variable names
  
  @return mixed The clean name or array of names