选中以PHP表单取消选中

Question

我试过了：

<?php
if(isset($_POST['submit']))
{
    echo $_POST['Privilege_Question_Name'];
    $Privilege_Question_Query = (($_POST['Privilege_Question_Name'] == "Privilege_Question_Value") ? 'Y' : 'N');
    echo $Privilege_Question_Query;
    exit();
}
?>

<form method="post"  action="" >
    <span class="float-right">Question Settings&nbsp;&nbsp;
    <input type="checkbox" name="Privilege_Question_Name" id="Privilege_Question_Id" value="Privilege_Question_Value"/></span>
    <br />
    <input type="submit" class="btn btn-lg btn-info" name="submit" value="Submit">
</form>

如果检查表单，它可以正常工作。 但如果没有 检查表格，则会有通知：

注意：未定义的索引：Privilege_Question_Name

Answer 1

首先不会发送未选中的复选框，因此请检查是否已设置。

if (isset($_POST['submit'])) {
    $Privilege_Question_Query = isset($_POST['Privilege_Question_Name']) ? 'Y' : 'N';
    echo $Privilege_Question_Query;
    exit();
}