Question

所以我有一个名为multiplier的变量，它包含一个特定的值，具体取决于用户注册的内容。我想在这里写的是

如果乘数等于＆＃34;久坐＆＃34;然后给它$sedmultiplier

的值

如果乘数等于＆＃34;轻微＆＃34;然后给它$lightmultiplier

的值

我坚持这一点，似乎无法弄清楚这是怎么写的。

  switch ($multiplier==) {
      case "sedentary":
         $multiplier=$sedmultiplier;
         break;
     case "lightly":
         $multiplier=$lightmultiplier;
          break;
      case "moderately":
         $multiplier=$modmultiplier;
         break;
      case "very":
         $multiplier=$verymultiplier;
         break;
      case "extremely":
         $multiplier=$extrememultiplier;
         break;
      default:
          multiplier==0;
  }

Answer 1

将 $ multiplier == 替换为 $ multiplier ，您的代码应该有效。

像这样：

switch ($multiplier) 
{
  case "sedentary":
     $multiplier=$sedmultiplier;
     break;
 case "lightly":
     $multiplier=$lightmultiplier;
      break;
  case "moderately":
     $multiplier=$modmultiplier;
     break;
  case "very":
     $multiplier=$verymultiplier;
     break;
  case "extremely":
     $multiplier=$extrememultiplier;
     break;
  default:
      $multiplier==0;
 }

Answer 2

就像@jeroen建议的那样，我会将乘数设置为数组。这样您就可以重复使用它们并更轻松地添加/删除乘数。

// Create the array with name => multiplier
$multipliers = [
    "sedentary"  => $sedmultiplier,
    "lightly"    => $lightmultiplier,
    "moderately" => $modmultiplier,
    "very"       => $verymultiplier,
    "extremely"  => $extrememultiplier,
    // ... just add more here, if needed...
];

// Check if we have a key with the current name.
// If we do, return the value, otherwise return 0 as default.
$multiplier = array_key_exists($multiplier, $multipliers)
    ? $multipliers[$multiplier]
    : 0;

PHP Switch语句比较问题

2 个答案: