public function filter($value)
    {
        return isset($this->map[$value]) ? $this->map[$value] : $value;
    }
public function filter($value)
    {
        return isset($this->map[$value]) ? $this->map[$value] : $value;
    }
public function filter ( $ value ) { return isset ( $ this -> map [ $ value ] ) ? $ this -> map [ $ value ] : $ value ; }
Returns the mapped or unfiltered value.

@param string $value

@return string
Returns the mapped or unfiltered value .