public static function formatQueryString($field, $opr, $value)
    {
        $key = ":_v".QueryStringParam::$_counter;
        $queryString = "$field  $opr $key";
        QueryStringParam::$_counter++;
        QueryStringParam::$params[$key] = $value;

        return $queryString;
    }
public static function formatQueryString($field, $opr, $value)
    {
        $key = ":_v".QueryStringParam::$_counter;
        $queryString = "$field  $opr $key";
        QueryStringParam::$_counter++;
        QueryStringParam::$params[$key] = $value;

        return $queryString;
    }
public static function formatQueryString ( $ field , $ opr , $ value ) { $ key = ":_v" . QueryStringParam :: $ _counter ; $ queryString = "$field  $opr $key" ; QueryStringParam :: $ _counter ++ ; QueryStringParam :: $ params [ $ key ] = $ value ; return $ queryString ; }
Format query string

@param string $field
@param string $opr operator
@param mixed $value
@return string
Format query string