php的if-else语句太多

只要其他1000多个字符串遵循相同的模式，此函数就会直接转换字符串。

// 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);

在这种情况下，SWITCH case应该更好。

经历这一切。。。

为什么是switch语句而不是if else？

是"；否则如果"；比"；switch（）大小写"；？

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;
        */   

    }

如果喜欢以下内容，请使用else：

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";
}

它会更快。

我还没有看到所有1000个if语句，但如果模式成立，您可以使用一个函数来替换文本。如前所述：

function convertDenpansarFeeString($ptp_car, $way)
{
    // number of characters in ptp_Denpasar_ = 13
    // number of characters in _car_ = 5
    return "ptp_"
        . substr($ptp_car
            , 13
            , strpos($ptp_car, "_fee_") - 13
        )
        . "_Denpasar_fee_"
        . $way
        . "_car_"
        . substr($ptp_car
            , strpos($ptp_car, "_car_") + 5
        );
}

像这样使用：

$ptp_car1 = convertDenpansarFeeString($ptp_car1, $way);
$ptp_car2 = convertDenpansarFeeString($ptp_car2, $way);

使用数组怎么样？

function getResult($key){
    $way = 'hello';
    $array = [
        'ptp_Denpasar_Ubud_fee_'.$way.'_car_1' => "ptp_Ubud_Denpasar_fee_".$way."_car_1",
        "ptp_Denpasar_Tanah_Lot_fee_".$way."_car_1" => "ptp_Sanur_Denpasar_fee_".$way."_car_1",
    ];
    return $array[$key];
}
echo getResult('ptp_Denpasar_Ubud_fee_hello_car_1');