php - 为什么我检查整数的 if 条件不起作用？

Question

             if($row['rank_code'] == 13 or 14)
              {
                //admin panel
                header("location:home_1");
                $_SESSION["hname"] = "$hname";
                exit();
              }
              elseif($row['rank_code'] == 7 or 8 or 9 or 10 or 11 or 12)
              {
                //senior panel
                header("location:home_2");
                $_SESSION["hname"] = "$hname";
                exit();
              }
              elseif($row['rank_code'] == 0 or 1 or 2 or 3 or 4 or 5 or 6)
              {
                //junior panel
                header("location:home_3");
                $_SESSION["hname"] = "$hname";
                exit();
             }

因为我想将我的头重定向到 home_3 但它总是将它重定向到 home_1..
因为 $row['rank_code'] 的值来自 mysql 数据库，它是 0..

Answer 1

您可以将 rank_code 值与具有每个 dest 值的数组进行比较:

$sendAdminPanel = array(13,14);
$sendSeniorPanel = array(7,8,9,10,11);
$sendJuniorPanel = array(0,1,2,3,4,5,6);

if (in_array($row['rank_code'],  $sendAdminPanel))
  {
  // go to admin panel
  }
elseif(..)
  {
 // go to senior panel
  }
...

或者只是检查 rank_code 是否在每个最大值和最小值之间。此选项的渲染速度比前一个更快:

if($val >= 13 && $val <= 14){
  //admin panel
  header("location:home_1");
  $_SESSION["hname"] = "$hname";
  exit();
}elseif($val >= 7 && $val <= 12){
  //senior panel
  header("location:home_2");
  $_SESSION["hname"] = "$hname";
  exit();
}elseif($val >= 0 && $val <= 6){
  //junior panel
  header("location:home_3");
  $_SESSION["hname"] = "$hname";
  exit();
}else{
  echo "rank_code is not valid";
}

您可以在文档中查看 php 比较提示: https://www.php.net/manual/en/language.operators.comparison.php
与许多值进行比较时，请尝试使用数组或其他适合比较值类型的解决方案。