切换箱有条件

Question

这里总是显示＆＃34;那很快！＆＃34;为什么是这样？为什么输出不应该是＆＃34;那个懒散的＆＃34;？

$totaltime = 12;
switch ($totaltime<=13) {

case 1:
echo "That was fast!";
break;

case 5:
echo "Not fast!";
break;

case 12:
echo "That's slooooow";
break;

case 15:
echo "That's too slooooow";
break;
}

Answer 1

您正在启用此功能：

$totaltime<=13

这是真的，所以它来到1，而1==true是真的，所以它'触发'。

你的意思不是吗？

switch ($totaltime) {

case 1:
echo "That was fast!";
break;

case 5:
echo "Not fast!";
break;

case 12:
echo "That's slooooow";
break;

case 15:
echo "That's too slooooow";
break;
}

Answer 2

（$ totaltime＆lt; = 13）被评估为1，这就是为什么你在第一种情况下结束，将代码更改为：

$totaltime = 12;
switch ($totaltime) {

case 1:
echo "That was fast!";
break;

case 5:
echo "Not fast!";
break;

case 12:
echo "That's slooooow";
break;

case 15:
echo "That's too slooooow";
break;
}

Answer 3

你正在使用一个条件用于switch语句。它应该是这样的：

$totaltime = 12;
switch ($totaltime) {

case 1:
echo "That was fast!";
break;

case 5:
echo "Not fast!";
break;

case 12:
echo "That's slooooow";
break;

case 15:
echo "That's too slooooow";
break;
}

Answer 4

这将有效：

   $totaltime = 12;
    switch ($totaltime) {

case 1:
echo "That was fast!";
break;

case 5:
echo "Not fast!";
break;

case 12:
echo "That's slooooow";
break;

case 15:
echo "That's too slooooow";
break;
}

Answer 5

我不确定，但我认为（$ totaltime＆lt; = 13）等于true或1.你应该只使用$ totaltime。