Question

寻找更简单的方法：

$switch_success = false;
switch ($var){
    case "a":
        // do some stuff
        $switch_success = true;
        break;
    case "b":
        // do some stuff
        $switch_success = true;
        break;
    case "c":
        // do some stuff
        $switch_success = true;
        break;
}
if ($switch_success){
    // switch was successful - run once only if switch finds a matching case
}

可能仅针对default或any的其他案例关键字all：

case "c":
    // do some stuff
    break;
all:
    // switch was successful - run once only if switch finds a matching case

或者也许......

$switch_success = switch ($var){
    case "a":
    // do some stuff
    break;
    case "b":
    // do some stuff
    break;
    case "c":
    // do some stuff
    break;
}
if ($switch_success) //...

试过这个无济于事，但只想说明我的意图。

Answer 1

在顶部尝试$switch_success=1;，在切换结束时尝试default: $switch_success=0;。

Answer 2

怎么样......

$switch_success = true;
switch ($var)
{
    case "a":
        // do some stuff
        break;
    case "b":
        // do some stuff
        break;
    case "c":
        // do some stuff
        break;
    default:
        $switch_success = false;
}
if ($switch_success){
    // switch was successful - run once only if switch finds a matching case
}

Answer 3

case子句默认为直通。

switch ($var){
    case "a":
    case "b":
    case "c":
        // do some stuff
        break;
    default
        // do nothing
        break;
}

但是如果你有针对每个案例做的事情，然后为所有事情要做的事情，你的原始例子就可以了。

Answer 4

如果我理解正确，如果符合任何的情况，您希望$ success成功，否则为false？如果是这样，设置$ success = true;在开始时，你的“默认”案例是$ success = false;然后你不必输入$ success = true;很多次。

Answer 5

也许这个？

$switch_success = true;
switch ($var){
    case "a":
        // do some stuff
        break;
    case "b":
        // do some stuff
        break;
    case "c":
        // do some stuff
        break;
    default:
        $switch_success = false;
        break;
}
if ($switch_success){
    // switch was successful - run once only if switch finds a matching case
}

Answer 6

我想不出更短的版本

if ($var == 'a' || $var == 'b' || $var == 'c') // do some stuff;

Answer 7

我会单独设置$switch_success，例如：

$switch_success = in_array($var, array("a","b","c"));

switch ($var) {
    case "a":
        // do some stuff
        break;
    case "b":
        // do some stuff
        break;
    case "c":
        // do some stuff
        break;
}

if ($switch_success) {
    // switch was successful
}

PHP - 仅在成功切换时运行代码

7 个答案: