需要有关 PHP 和 HTML 的帮助

Question

我目前正在为我的网络开发课程做作业。前提是创建一个简单的“音乐会订购站点”。一切都很好，但我将运行保存到此错误消息中：

Notice: Undefined index: chooseTheAmountOfTickets in C:\xampp\htdocs\webtech\coursework\chapter05\event.php on line 22

这是我的 PHP（注意：我的 <?php 开头）：

$firstName = $_POST['firstName'];
$phoneNumber = $_POST['phoneNumber'];
$chooseTheAmountOfTickets = $_POST['chooseTheAmountOfTickets'];
$costOfTickets = 35;

$total = $chooseTheAmountOfTickets * $costOfTickets;

print("<p><b>Your total estimated cost is $$total. </b></p>"); 


?>]

这是我的 HTML:

    <form action = "event.php" method = "post">
    <p>First Name
    <input type = "text" size = "10" name = "firstName">
    </p>

     <form action = "event.php" method = "post">
    <p>Phone Number
    <input type = "text" size = "10" name = "phoneNumber">
    
    
    <form action = "event.php" method = "post" >
    <p>Choose the amount of tickets
    <input type= "number" method = "post">


    
    
    </p>
    <p><i>Tickets will be  each not including tax and fees.</i></p>
    <p>
    <input type = "submit" value = "Calculate Tickets">
    </p>
    </form>
    

    
    
    </p></td>
    <td><b> PER TICKET</b></td>

Answer 1

您没有具有 name="chooseTheAmountOfTickets" 值的表单控件。我假设这就是本意：

<input type= "number" method = "post">

页面上还有多个表单。如果这些都应该是一个表单提交，你想要这样的东西：

<form action="event.php" method="post">
    <p>First Name
    <input type="text" size="10" name="firstName">
    </p>

    <p>Phone Number
    <input type="text" size="10" name="phoneNumber">
    </p>
    
    <p>Choose the amount of tickets
    <input type="number" name="chooseTheAmountOfTickets">
    </p>
    
    <p><i>Tickets will be  each not including tax and fees.</i></p>
    
    <p>
    <input type="submit" value="Calculate Tickets">
    </p>
</form>

可能会觉得这有帮助：https://developer.mozilla.org/en-US/docs/Learn/Forms/Your_first_form

Answer 2

似乎正在为这条线苦苦挣扎：

$chooseTheAmountOfTickets = $_POST['chooseTheAmountOfTickets'];

查看您的 HTML 代码，您为前两个输入定义了名称，但没有为最后一个输入定义名称。您所要做的就是为该输入命名，如下所示：

<input type= "number" name = "chooseTheAmountOfTickets">

php 文件要查找的是“chooseTheAmountOfTickets”。

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