Question

我想在所有分页中保持选中单选按钮。为了taht

我已经在页面顶部的分页中收集了选中的值。

但它运作不佳。

此代码有什么问题？

这就是我在会话中获得单选按钮的选择值

session_start();
if(isset($_POST['answer'])) {
    $_SESSION['answer'] = $_POST['answer'];
}

这是我的php代码

<input type="radio"  name="answer" value="yes" <?php if(isset($_SESSION['answer'])=='yes') {echo "checked"; }?> />
<input type="radio"  name="answer" value="no" <?php if(isset($_SESSION['answer'])=='no') {echo "checked"; }?> />
<input type="radio"  name="answer" value="yes1" <?php if(isset($_SESSION['answer'])=='yes1') {echo "checked"; }?> />
<input type="radio"  name="answer" value="yes2" <?php if(isset($_SESSION['answer'])=='yes2') {echo "checked"; }?> />

它给了我错误（通知），就像答案是未定义的索引。

Answer 1

isset（）返回true或false。你的if语句应该是，例如：

if (isset($_SESSION['answer']) && $_SESSION['answer'] == 'yes')

Answer 2

尝试：

$values = array('yes', 'no', 'yes1', 'yes2');
foreach ( $values as $value ) {
  $checked = isset($_SESSION['answer']) && $_SESSION['answer'] == $value ? 'checked="checked"' : '';
  echo '<input type="radio"  name="answer" value="' . $value . '" ' . $checked . '/>';
}

Answer 3

<input type="radio"  name="answer" value="yes" <?php if($_SESSION['answer']=='yes') { ?> checked="checked" <?php }?> />
<input type="radio"  name="answer" value="no"  <?php if($_SESSION['answer']=='no') { ?> checked="checked" <?php }?> />
<input type="radio"  name="answer" value="yes1" <?php if($_SESSION['answer']=='yes1') { ?> checked="checked" <?php }?> />
<input type="radio"  name="answer" value="yes2" <?php if($_SESSION['answer']=='yes2') { ?> checked="checked" <?php }?> />

please use this html

在会话中检查单选按钮的问题

3 个答案: