php - 如何在两个字段答案上都显示错误 '0'

Question

我试图弄清楚，如果用户在两个字段中都选择了“0”，则会弹出错误消息并说明至少其中一个字段必须填写数量。

正如您在下面看到的:表单字段有一个与之关联的错误，即 $maleErr 或 $femaleErr ...

我是这样写的:

   if (($_POST["male"] === "") && ($_POST["female"] === "")) {
  $quantityErr = "Please fill at least one of the fields, either male or female."

然后将 $quantityErr 添加到表单字段中，如下所示:(它的值(value)不起作用。页面只是空白。

    <div class="field">
      <label>* Number of People</label>
      <select class="ui dropdown" name="female">
        <option value="">Gender Female</option>
        <option <?php if ($female === 0 ) echo 'selected' ; ?> value="0">0</option>
        <option <?php if ($female == 1 ) echo 'selected' ; ?> value="1">1</option>
        <option <?php if ($female == 2 ) echo 'selected' ; ?> value="2">2</option>
        <option <?php if ($female == 3 ) echo 'selected' ; ?> value="3">3</option>
        <option <?php if ($female == 4 ) echo 'selected' ; ?> value="4">4</option>
        <option <?php if ($female == 5 ) echo 'selected' ; ?> value="5">5</option>
        <option <?php if ($female == 6 ) echo 'selected' ; ?> value="6">6</option>
        <option <?php if ($female == 7 ) echo 'selected' ; ?> value="7">7</option>
        <option <?php if ($female == 8 ) echo 'selected' ; ?> value="8">8</option>
        <option <?php if ($female == 9 ) echo 'selected' ; ?> value="9">9</option>
        <option <?php if ($female == 10 ) echo 'selected' ; ?> value="10">10</option>
      </select>
      <?php if(isset($femaleErr)) print ('<span class="error">* ' . $femaleErr || $quantityErr . '</span>'); ?>
    </div>

没有如上所述修改的当前表单字段

        <div class="field">
          <label>* Number of People</label>
          <select class="ui dropdown" name="male">
            <option value="">Gender Male</option>
            <option <?php if ($male === 0 ) echo 'selected' ; ?> value="0">0</option>
            <option <?php if ($male == 1 ) echo 'selected' ; ?> value="1">1</option>
            <option <?php if ($male == 2 ) echo 'selected' ; ?> value="2">2</option>
            <option <?php if ($male == 3 ) echo 'selected' ; ?> value="3">3</option>
            <option <?php if ($male == 4 ) echo 'selected' ; ?> value="4">4</option>
            <option <?php if ($male == 5 ) echo 'selected' ; ?> value="5">5</option>
            <option <?php if ($male == 6 ) echo 'selected' ; ?> value="6">6</option>
            <option <?php if ($male == 7 ) echo 'selected' ; ?> value="7">7</option>
            <option <?php if ($male == 8 ) echo 'selected' ; ?> value="8">8</option>
            <option <?php if ($male == 9 ) echo 'selected' ; ?> value="9">9</option>
            <option <?php if ($male == 10 ) echo 'selected' ; ?> value="10">10</option>
          </select>
          <?php if(isset($maleErr)) print ('<span class="error">* ' . $maleErr . '</span>'); ?>
        </div>


        <div class="field">
          <label>* Number of People</label>
          <select class="ui dropdown" name="female">
            <option value="">Gender Female</option>
            <option <?php if ($female === 0 ) echo 'selected' ; ?> value="0">0</option>
            <option <?php if ($female == 1 ) echo 'selected' ; ?> value="1">1</option>
            <option <?php if ($female == 2 ) echo 'selected' ; ?> value="2">2</option>
            <option <?php if ($female == 3 ) echo 'selected' ; ?> value="3">3</option>
            <option <?php if ($female == 4 ) echo 'selected' ; ?> value="4">4</option>
            <option <?php if ($female == 5 ) echo 'selected' ; ?> value="5">5</option>
            <option <?php if ($female == 6 ) echo 'selected' ; ?> value="6">6</option>
            <option <?php if ($female == 7 ) echo 'selected' ; ?> value="7">7</option>
            <option <?php if ($female == 8 ) echo 'selected' ; ?> value="8">8</option>
            <option <?php if ($female == 9 ) echo 'selected' ; ?> value="9">9</option>
            <option <?php if ($female == 10 ) echo 'selected' ; ?> value="10">10</option>
          </select>
          <?php if(isset($femaleErr)) print ('<span class="error">* ' . $femaleErr . '</span>'); ?>
        </div>

当前错误检查没有修改如上所述

   if ($_POST["male"] === "") {
     $maleErr = "# of people (gender male) required";
   } else {
     $male = test_input($_POST["male"]);
   }

    if ($_POST["female"] === "") {
     $femaleErr = "# of people (gender female) required";
   } else {
     $female = test_input($_POST["female"]);
   }

额外编辑

可以改用它吗？因为每次我尝试提交表单时，不幸的是它提交了而不是弹出错误。

  if (($_POST["male"] == 0) && ($_POST["female"] == 0)) {
      $quantityErr = "Please fill at least one of the fields, either male or female.";
  }

这就是字段的内容:(女性和男性都相同)

<?php if(isset($femaleErr)) print ('<span class="error">* ' . $femaleErr . '</span>'); ?>
<?php if(isset($quantityErr)) print ('<span class="error">* ' . $quantityErr . '</span>'); ?>

Answer 1

首先，您应该打开错误报告或调查您的错误日志文件(如果已打开)。我这样说是因为您描述的白页是解析错误的结果。您忘记在此处的 isset 上将 $femaleErr 更改为 $quantityErr:

<?php if(isset($femaleErr)) print ('<span class="error">* ' . $femaleErr || $quantityErr . '</span>'); ?>

如果 $femaleErr 未定义，则此代码将永远不会运行，因为它未设置。 (我看不到它在您的示例中设置的位置)。

但您遇到问题的原因很可能是 ||。 print() 需要一个字符串。您的逻辑运算无效，如果正确完成，它将输出 1 或 0(真或假)而不是设置的变量:print('stuff'. ($varone || $vartwo) .'otherstuff')//打印 stuff1otherstuff。

所以改为尝试:

$msg = array();
if( isset($femaleErr) )
    $msg[] = $femaleErr;

if( isset($quantityErr ) )
    $msg[] = $quantityErr ;

foreach($msg as $msg)
{
   echo '<span class="error">* '.$msg.'</span>';
}

这将检查每个变量，查看它们是否已设置，如果已设置，它将把它添加到消息数组中。然后 foreach 将遍历数组并打印出相应的消息。如果数组为空，则什么都不做。空数组是 foreach 的有效输入(只需要是一个数组)。