Question

如果bool为true，我想在下拉列表中添加一个选项，例如，如果ownsuv = true，它会将其添加到下拉列表中，包括他/她拥有的其他车辆。编辑：添加代码

<?
$showgender = true;
if($showgender = true){
<html>
<p>
What is your Gender?
<select name="formGender">
  <option value="">Select...</option>
  <option value="M">Male</option>
  <option value="F">Female</option>
</select>
</p>
</html>
}
 ?>

Answer 1

您可以将select元素放在变量中，如下所示：

$select_element = <<<HTML
<p>
What is your Gender?
<select name="formGender">
  <option value="">Select...</option>
  <option value="M">Male</option>
  <option value="F">Female</option>
</select>
</p>
HTML;

现在，如果$showgender为真，则显示$select_element，如下所示：

<html>
    <body>
        <h1>Welcome to my wonderful form</h1>
        <form>
<?php
if ($showgender) {
    echo $select_element;
}
?>
        </form>
    </body>
</html>

Answer 2

<?php

$showgender = true;
if ($showgender) {
  echo '
  <html>
  <p>
  What is your Gender?
  <select name="formGender">
    <option value="">Select...</option>
    <option value="M">Male</option>
    <option value="F">Female</option>
  </select>
  </p>
  </html>
  ';
}
 ?>

Answer 3

首先，如果你没有添加结束，你会遇到PHP错误吗？＆gt;在你的if子句之后：

<?php
$showgender = true;
if($showgender == true){
?>
<html>
<p>
What is your Gender?
<select name="formGender">
  <option value="">Select...</option>
  <option value="M">Male</option>
  <option value="F">Female</option>
</select>
</p>
</html>
<?php
}
?>

如果你想添加一个选项，那就这样做：

<?php
$showgender = true;
if($showgender == true){
?>
<html>
<p>
What is your Gender?
<select name="formGender">
  <option value="">Select...</option>
  <option value="M">Male</option>
  <option value="F">Female</option>
  <?php if($yourboolean == true) { ?>
  <option value="X">Feel Free</option>
  <?php } ?>
</select>
</p>
</html>
<?php
}
?>

如果bool为true，则向下拉列表添加选项

3 个答案: