How to use PHP to implement form validation and submission functions-PHP Tutorial-php.cn

How to use PHP to implement form validation and submission functions

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Release： 2023-09-05 18:16:02

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如何使用 PHP 实现表单验证和提交功能

How to use PHP to implement form validation and submission functions

Overview:
In website development, forms are one of the important ways to interact with users. Forms are often used to collect information from users or receive feedback from users. In order to ensure the legality and integrity of the data submitted in the form, we need to verify the form. This article will introduce how to use PHP to implement form validation and submission functions, and provide relevant code examples.

Step 1: Create HTML form
First, we need to create an HTML form to collect user input data. The sample code is as follows:

<!DOCTYPE html>
<html>
<head>
<title>表单验证和提交示例</title>
</head>
<body>
<h2>用户信息</h2>

<form action="submit.php" method="post">
  <label for="name">姓名：</label>
  <input type="text" id="name" name="name" required><br><br>

  <label for="email">邮箱：</label>
  <input type="email" id="email" name="email" required><br><br>

  <label for="phone">电话：</label>
  <input type="tel" id="phone" name="phone" required><br><br>

  <input type="submit" value="提交">
</form>

</body>
</html>

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Step 2: Create a PHP script file
Next, we need to create a PHP script file to validate the form data and submit it to the server. The sample code is as follows (the file name is submit.php):

<!DOCTYPE html>
<html>
<head>
<title>表单验证和提交示例</title>
</head>
<body>

<h2>提交结果</h2>

<?php
// 验证表单数据
$name = $_POST['name'];
$email = $_POST['email'];
$phone = $_POST['phone'];

$errors = [];

// 验证姓名
if (empty($name)) {
  $errors[] = "姓名不能为空";
}

// 验证邮箱
if (empty($email)) {
  $errors[] = "邮箱不能为空";
} else if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  $errors[] = "邮箱格式不正确";
}

// 验证电话
if (empty($phone)) {
  $errors[] = "电话不能为空";
} else if (!preg_match('/^d{11}$/', $phone)) {
  $errors[] = "电话格式不正确";
}

// 如果有错误，则显示错误信息
if (!empty($errors)) {
  foreach ($errors as $error) {
    echo "<p>{$error}</p>";
  }
} else {
  // 执行提交操作
  // ...

  echo "<p>提交成功</p>";
}
?>

</body>
</html>

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Step 3: Form verification
In the above code, we obtain the form submission through PHP's $_POST super global variable data and verify it. If the data does not meet the requirements, error information is added to the $errors array. The specific verification rules are as follows:

The name cannot be empty
The email address cannot be empty and must be a legal email format
The phone number cannot be empty and must be It is an 11-digit number

Step 4: Submit operation
If all the data in the form is verified, you can perform the relevant submission operation. Here is only a simple success tip. In actual operation, you may need to store data in the database or send emails.

Summary:
Through the above steps, we can use PHP to implement form verification and submission functions. In actual development, we can conduct more detailed verification of form fields and add more submission operations according to specific needs. This ensures that we receive valid and complete data from our users.

Note: Due to security risks in modern website development, we strongly recommend dual verification on both front-end and back-end to enhance the security of the website.

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