Question

因此，我有一个foreach循环，可在数据库中插入值，我想在循环结束时显示警报，并检查插入是否成功

我有这个

if (isset($_POST['alter'])) {
  # code...
    foreach ($_POST['id'] as $key => $id) {
      $array1 = $_POST['name'][$key];
      $array2 = $_POST['surname'][$key];
      $array3 = $_POST['tel'][$key];
      $array4 = $_POST['email'][$key];
      $query = $link -> prepare("UPDATE table SET name = ? , surname = ? , tel = ? , email = ? WHERE id = ?;");
      $query -> bind_param('sssss',$array1,$array2,$array3,$array4,$id);
      $s = $query -> execute();
      $query -> close();
      if ($s==1){
         ?><div class="alert alert-success">
               <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
               <strong>SUCCESS!</strong>
           </div><?php
       } else {
           ?><div class="alert alert-danger">
                <button type="button" class="close" data-dismiss="alert" aria- hidden="true">×</button>
                <strong>ERROR.</strong>
             </div><?php
       }
    }
}

但这将在页面中多次显示警报

我如何使其仅显示一个警报？

Answer 1

要警告每个失败的更新，可以在循环中将值存储在数组中。然后，在循环结束时，如果该数组为空，则可以给出成功消息，否则将回显失败消息和失败数组的内容。

if (isset($_POST['alter'])) {
  # code...
    $failures = array();
    foreach ($_POST['id'] as $key => $id) {
      $array1 = $_POST['name'][$key];
      $array2 = $_POST['surname'][$key];
      $array3 = $_POST['tel'][$key];
      $array4 = $_POST['email'][$key];
      $query = $link -> prepare("UPDATE table SET name = ? , surname = ? , tel = ? , email = ? WHERE id = ?;");
      $query -> bind_param('sssss',$array1,$array2,$array3,$array4,$id);
      if (!$query -> execute()) {
          $failures[] = "failed to update id $id with values ($array1, $array2, $array3, $array4)<br>";
      }
      $query -> close();
    }
    if (!count($failures)){
       ?><div class="alert alert-success">
             <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
             <strong>SUCCESS!</strong>
         </div><?php
     } else {
         ?><div class="alert alert-danger">
              <button type="button" class="close" data-dismiss="alert" aria- hidden="true">×</button>
              <strong>ERROR.</strong>
           <?php
           foreach ($failures as $failure) {
               echo $failure;
           }
           ?>   
           </div><?php
     }
}

请注意，针对1测试布尔值虽然可以在当前的PHP版本中运行，但这不是一个好习惯。您应该使用布尔值本身作为表达式，即使用if ($success)，而不是if ($success == 1)。

Foreach结束循环警报

1 个答案: