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:

  姓名：
  

  邮箱：
  

  

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:

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():

4. Handle errors

If you encounter a verification error, you can use the following code Display error message:

无效的电子邮件地址
";
}
?>

Practical case

The following is an example of using the above function to create an interactive user registration form:

  用户名：
  

  密码：
  

  

无效的用户名
";
  } else if (!preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$/', $password)) {
    echo "
无效的密码
";
  } 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 "
注册成功！
";
  }
}
?>

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