Question

我有以下代码，并想知道是否有更好的方法来使用if-else和相同的结果，而不是使用相同的其他三次？

if($condition1) {
   // some code to get condition 2
   if($condition2) {
      // some code to get condition 3
      if($condition3) {
         $dt = $something;
      } else {
         $dt = "";
      }
   } else {
      $dt = "";
   }
} else {
   $dt = ""; 
}

Answer 1

您可以轻松删除一些额外的else语句。

$dt = ""; // Assign $dt in the beginning

if ($condition1) {
    // some code to get condition 2
    if ($condition2 && $condition3) {
      // some code to get condition 3
      $dt = $something;
    }
}

Answer 2

避免嵌套语句的两种方法。

使用函数

$dt = doSomething($params);

function someFunction ($params) {

    if (!$condition1) {
        return "";
    }

    // do stuff for condition 1

    if (!$condition2) {
        return "";
    }

    // do stuff for condition 2

    if (!$condition3) {
        return "";
    }

    return $something;
}

使用do / while语句

do {

    $dt = "";

    if (!$condition1) {
        break;
    }

    // do stuff for condition 1

    if (!$condition2) {
        break;
    }

    // do stuff for condition 2

    if (!$condition3) {
        break;
    }

    $dt = $something;

} while (0); // since this will evaluate to false it will not loop at all.

嵌套的if-else语句，带有相同的else代码

2 个答案: