php太多if else语句

Question

我有下面的php代码：

if($ptp_car_1 == "ptp_Denpasar_Ubud_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Ubud_Denpasar_fee_".$way."_car_1";
    }
    if($ptp_car_1 == "ptp_Denpasar_Tanah_Lot_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Tanah_Lot_Denpasar_fee_".$way."_car_1";
    }
    if($ptp_car_1 == "ptp_Denpasar_Sanur_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Sanur_Denpasar_fee_".$way."_car_1";
    }
    if($ptp_car_1 == "ptp_Denpasar_Seminyak_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Seminyak_Denpasar_fee_".$way."_car_1";
    }
    if($ptp_car_1 == "ptp_Denpasar_Kuta_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Kuta_Denpasar_fee_".$way."_car_1";
    }
    if($ptp_car_1 == "ptp_Denpasar_Jimbaran_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Jimbaran_Denpasar_fee_".$way."_car_1";
    }
    if($ptp_car_1 == "ptp_Denpasar_Nusa_Dua_fee_".$way."_car_1"){
        $ptp_car_1 = "ptp_Nusa_Dua_Denpasar_fee_".$way."_car_1";
    }
// many code over 1,000

我如何优化它？我希望页面运行得更快，现在太慢了。

Answer 1

在这种情况下，开关的情况应该更好。

经历这个..。

Why the switch statement and not if-else?

Is "else if" faster than "switch() case"?

试试看，

switch ($ptp_car_1){   
        case "ptp_Denpasar_Ubud_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Ubud_Denpasar_fee_".$way."_car_1";
        }
        break;
        case "ptp_Denpasar_Tanah_Lot_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Tanah_Lot_Denpasar_fee_".$way."_car_1";
        }
        break;
        case "ptp_Denpasar_Sanur_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Sanur_Denpasar_fee_".$way."_car_1";
        }
        break;
        case "ptp_Denpasar_Seminyak_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Seminyak_Denpasar_fee_".$way."_car_1";
        }
        break;
        case "ptp_Denpasar_Kuta_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Kuta_Denpasar_fee_".$way."_car_1";
        }
        break;
        case "ptp_Denpasar_Jimbaran_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Jimbaran_Denpasar_fee_".$way."_car_1";
        }
        break;
        case "ptp_Denpasar_Nusa_Dua_fee_".$way."_car_1":
        {
             $ptp_car_1 = "ptp_Nusa_Dua_Denpasar_fee_".$way."_car_1";
        }
        break;

        /*
        //OPTIONAL

        default:
            $ptp_car_1 = $ptp_car_1;

        */   


    }

Answer 2

只要其他1000+字符串遵循相同的模式，此函数将直接转换字符串。

// reorder parts if the following pattern is true for all entries
//
// starts with "ptp" (store as group 1)
// then contains an '_'
// then has at least 1 char that is not an '_' (store as group 2)
// then contains an '_'
// then contains at least 1 char that is not '_fee_' (store as group 3)
// then contains an '_'
// then contains any number of chars (store as group 4)
//
// group 4 will contain 'fee_', $way and '_car_1' but we really don't need to care what
// those chars are, they just get tacked on to the end.
// 
// Once the original is broken up, parts 2 & 3 are swapped and the 
// results are imploded into the desired string with '_' separators.
//
function swapPtpParts($ptp_car_1) {
    $matches = [];
    if(preg_match("/(ptp)_([^_]+)_(.+?(?=_fee_))_(.*)/", $ptp_car_1, $matches)) {
        $parts = [
            $matches[1],
            $matches[3],
            $matches[2],
            $matches[4],
        ];
        return implode('_', $parts);
    }
    return $ptp_car_1;    
}

用法：

$ptp_car_1 = swapPtpParts($ptp_car_1);

Answer 3

如果如下所示，请使用其他方法：

if($ptp_car_1 == "ptp_Denpasar_Ubud_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Ubud_Denpasar_fee_".$way."_car_1";
}
elseif($ptp_car_1 == "ptp_Denpasar_Tanah_Lot_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Tanah_Lot_Denpasar_fee_".$way."_car_1";
}
elseif($ptp_car_1 == "ptp_Denpasar_Sanur_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Sanur_Denpasar_fee_".$way."_car_1";
}
elseif($ptp_car_1 == "ptp_Denpasar_Seminyak_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Seminyak_Denpasar_fee_".$way."_car_1";
}
elseif($ptp_car_1 == "ptp_Denpasar_Kuta_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Kuta_Denpasar_fee_".$way."_car_1";
}
elseif($ptp_car_1 == "ptp_Denpasar_Jimbaran_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Jimbaran_Denpasar_fee_".$way."_car_1";
}
elseif($ptp_car_1 == "ptp_Denpasar_Nusa_Dua_fee_".$way."_car_1"){
    $ptp_car_1 = "ptp_Nusa_Dua_Denpasar_fee_".$way."_car_1";
}

这样会更快。