[英]Basic Registration Form with PHP
你能帮我么。 我是PHP的初学者,仍然在学习该语言的基础知识。 我目前正在学习如何创建会话。 当我尝试书中的一个例子时,显然有一个错误。 HTML表单如下所示:
<form action="session_registration_form_script.php" method="post">
<label for="name">Name:</label>
<input type="text" name="name" />
<label for="email">Email:</label>
<input type="text" name="email" />
<input type="submit" value="Register" />
</form>
和PHP脚本是这样的:
<?php
// Initialize session data
session_start();
/*
* If the user is already registered, display a
* message letting them know.
*/
if(isset($_SERVER['username'])) {
echo "You're already registered as $_SESSION[username]";
}
// Checks if the form was submitted
else if($_SERVER['REQUEST_METHOD'] == 'POST') {
/*
* If both the username and email fields were filled
* out, save the username in a session variable and
* output a thank you message to the browser. To
* eliminate leading and trailing whitespace, we use the
* trim() function
*/
if(!empty(trim($_POST['username']))
&& !empty(trim($_POST['email']))) {
// Store escaped $_POST values in variables
$uname = htmlentities($_POST['username']);
$email = htmlentities($_POST['email']);
$_SESSION['username'] = $uname;
echo "Thanks for registering! <br />",
"Username: $uname <br />",
"Email: $email <br />";
}
/*
* If the user did not fill out both fields, display
* a message letting them know that both fields are
* required for registration
*/
else {
echo "Please fill out both fields! <br />";
}
}
// If the form was not submitted, dispalys the HTML form
else {
?>
<?php } ?>
当我在浏览器上输出两个文件时,浏览器会报告: 致命错误:无法在“文件路径”和代码行的写入上下文中使用函数值。
请通过修复此问题来帮助您,并随意添加您可能对我有用的任何内容。 提前致谢...
我可以在您的代码中看到许多问题。
if(isset($_SERVER['username'])) {
echo "You're already registered as $_SESSION[username]";
}
应该
if(isset($_SESSION['username'])) {
echo "You're already registered as ".$_SESSION['username'];
}
此外,当您的表单字段名为name
时,您正在寻找名为username
的$_POST
变量。
至于你看到的实际错误,那是因为你一直使用empty
和trim
的方式 - 你应该分别检查2。 例如
$uname = isset($_POST['username']) ? trim($_POST['username']) : '';
$email = isset($_POST['email']) ? trim($_POST['email']) : '';
if(!empty($uname) && !empty($email)) {
我认为在检查变量是否为空之前,在接收到变量之后修剪变量是一个好主意
$uname = trim($_POST['username']);
$email = trim($_POST['email']);
if(!empty($uname) && !empty($email)) {
//if(!empty($_POST['username']) && !empty($_POST['email']))
//{
// Store escaped $_POST values in variables
$uname = htmlentities($_POST['username']);
$email = htmlentities($_POST['email']);
$_SESSION['username'] = $uname;
echo "Thanks for registering! <br />",
"Username: $uname <br />",
"Email: $email <br />";
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.