Home > Article > Backend Development > Create interactive web forms using PHP functions
PHP provides functions for creating and processing interactive web forms, including: creating form elements (using HTML to define fields); using $_POST or $_GET to access form data; using filter_var() to validate input; using error messages Handle validation errors.
Using PHP functions to create interactive web forms
A wide range of functions are provided in PHP to help create and process interactive web forms form. This article explains how to use these functions to build a fully functional form.
1. Create form elements
We use HTML to define form elements as follows:
<form action="process.php" method="post"> <label for="name">姓名:</label> <input type="text" id="name" name="name" required> <label for="email">邮箱:</label> <input type="email" id="email" name="email" required> <input type="submit" value="提交"> </form>
2. Use PHP functions Processing form data
After the user submits the form, you can use the $_POST
or $_GET
function to access the form data.
For the above form, we can use the following PHP code to process the data:
<?php if ($_SERVER["REQUEST_METHOD"] == "POST") { $name = $_POST['name']; $email = $_POST['email']; // 在这里处理表单数据 } ?>
3. Validate form input
In order to ensure that the form input is valid, you can Use PHP's verification function, such as filter_var()
:
<?php if (filter_var($email, FILTER_VALIDATE_EMAIL)) { // 有效的电子邮件地址 } else { // 无效的电子邮件地址 } ?>
4. Handle errors
If you encounter a verification error, you can use the following code Display error message:
<?php if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "<p>无效的电子邮件地址</p>"; } ?>
Practical case
The following is an example of using the above function to create an interactive user registration form:
<!-- form.php --> <form action="process.php" method="post"> <label for="username">用户名:</label> <input type="text" id="username" name="username" required> <label for="password">密码:</label> <input type="password" id="password" name="password" required> <input type="submit" value="注册"> </form>
<!-- process.php --> <?php if ($_SERVER["REQUEST_METHOD"] == "POST") { // 获取表单数据 $username = $_POST['username']; $password = $_POST['password']; // 验证表单输入 if (!preg_match('/^[a-zA-Z0-9]+$/', $username)) { echo "<p>无效的用户名</p>"; } else if (!preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$/', $password)) { echo "<p>无效的密码</p>"; } else { // 密码散列和插入数据库 $hashedPassword = password_hash($password, PASSWORD_DEFAULT); $query = "INSERT INTO users (username, password) VALUES (?, ?)"; $stmt = $conn->prepare($query); $stmt->bind_param('ss', $username, $hashedPassword); $stmt->execute(); echo "<p>注册成功!</p>"; } } ?>
The above is the detailed content of Create interactive web forms using PHP functions. For more information, please follow other related articles on the PHP Chinese website!