How to implement modifiable information on PHP web pages
In website development, it is very important to provide users with interactive and modifiable information. PHP is a very popular server-side programming language that can be used to develop dynamic websites. This article will introduce how to implement modifiable information on PHP web pages.
1. Basic Principle
The information on the web page is usually stored in a database. PHP provides many functions for operating databases. We can obtain, modify, add, delete data in the database through these functions, and display it on the web page. The following takes the MySQL database as an example.
1. Connect to the database
To connect to the MySQL database in PHP, you need to use mysqli or PDO extension. The specific connection method is as follows:
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
?>2. Query data
You need to use the SELECT statement to query data. The following is an example:
$sql = "SELECT id, name, email FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. " " . $row["email"]. "<br>";
}
} else {
echo "0 结果";
}3. Modify data
You need to use the UPDATE statement to modify data. The following is an example:
$sql = "UPDATE users SET email='newemail@example.com' WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "记录更新成功";
} else {
echo "Error updating record: " . $conn->error;
}2. Implementing a modifiable web page
After understanding the basic principles, we can start to implement a modifiable web page. First you need to create an HTML form for updating data.
<!DOCTYPE html> <html> <body> <form action="update.php" method="post"> <label for="name">Name:</label><br> <input type="text" id="name" name="name"><br> <label for="email">Email:</label><br> <input type="text" id="email" name="email"><br><br> <input type="submit" value="Submit"> </form> </body> </html>
This form contains two text boxes for entering your name and email. After submission, the data is sent to the update.php page for processing.
The update.php page needs to complete the following steps:
1. Establish a connection and obtain form data.
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
$name = $_POST["name"];
$email = $_POST["email"];
?>2. Update the data in the database.
$sql = "UPDATE users SET email='$email' WHERE name='$name'";
if ($conn->query($sql) === TRUE) {
echo "记录更新成功";
} else {
echo "Error updating record: " . $conn->error;
}3. Close the connection.
$conn->close();
Finally, combine these two pages into one. That is, the data is displayed in the show.php page and a button linked to the update.php page is provided. Clicking the button can enter the form page for modifying the data. The following is an example:
connect_error) {
die("连接失败: " . $conn->connect_error);
}
$sql = "SELECT id, name, email FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. " " . $row["email"]. "
";
echo "修改
";
}
} else {
echo "0 结果";
}
$conn->close();
?>
3. Summary
This article introduces how to implement modifiable information on PHP web pages. By connecting to the database, querying data, modifying data and other operations, we can easily realize the interactivity and editability of the website.
The above is the detailed content of How to implement modifiable information on PHP web pages. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1378
52
PHP 8 JIT (Just-In-Time) Compilation: How it improves performance.
Mar 25, 2025 am 10:37 AM
PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.
PHP Secure File Uploads: Preventing file-related vulnerabilities.
Mar 26, 2025 pm 04:18 PM
The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.
OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.
Mar 26, 2025 pm 04:13 PM
The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.
PHP Encryption: Symmetric vs. asymmetric encryption.
Mar 25, 2025 pm 03:12 PM
The article discusses symmetric and asymmetric encryption in PHP, comparing their suitability, performance, and security differences. Symmetric encryption is faster and suited for bulk data, while asymmetric is used for secure key exchange.
PHP Authentication & Authorization: Secure implementation.
Mar 25, 2025 pm 03:06 PM
The article discusses implementing robust authentication and authorization in PHP to prevent unauthorized access, detailing best practices and recommending security-enhancing tools.
PHP API Rate Limiting: Implementation strategies.
Mar 26, 2025 pm 04:16 PM
The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand
What is the purpose of prepared statements in PHP?
Mar 20, 2025 pm 04:47 PM
Prepared statements in PHP enhance database security and efficiency by preventing SQL injection and improving query performance through compilation and reuse.Character count: 159
How do you retrieve data from a database using PHP?
Mar 20, 2025 pm 04:57 PM
Article discusses retrieving data from databases using PHP, covering steps, security measures, optimization techniques, and common errors with solutions.Character count: 159
