Build Your First Dynamic PHP Website in 6 Simple Steps

1. Set up the environment

Before writing code you need a PHP runtime, web server and a database. Instead of installing Apache, PHP and MySQL separately, you can use an integrated package such as phpStudy or XAMPP that configures everything with a few clicks. After installation start the service and verify by opening http://localhost in a browser.

2. PHP basics

PHP code is embedded in an HTML file and executed on the server. When a request arrives, the server runs the PHP, generates HTML, and sends it back. Variables start with $, e.g. $username = "小明";, and output is produced with echo. Control structures such as if allow conditional output, e.g. a script that greets “上午好！” before noon and “下午好！” otherwise.

php
$hour = date("H");
if ($hour < 12) {
    echo "上午好！";
} else {
    echo "下午好！";
}

3. Connect to MySQL

Dynamic sites need persistent storage; MySQL is the most common choice with PHP. Create a database and a table for messages, then use mysqli functions to connect, insert, and query data.

php
// Connect to database
$conn = mysqli_connect("localhost", "username", "password", "mywebsite");

// Insert a new message
$sql = "INSERT INTO messages (username, content) VALUES ('小明', '这是我的第一条留言')";
mysqli_query($conn, $sql);

4. User interaction with forms

HTML forms let users send data to the server. A simple guest‑book form includes fields for name and message and a submit button. In PHP the submitted values are accessed via $_POST or $_GET, validated, and stored in the database.

php
// Get form data
$username = $_POST['username'];
$message  = $_POST['message'];

// Store safely after validation

5. Assemble a minimal functional site

The final project consists of three files: config.php (database connection), index.php (display messages and show the form), and submit.php (process submissions). Together they provide a complete, working message board.

6. Next steps

After the basic site works, you can improve it by using PDO for safer database access, a template engine like Smarty, object‑oriented PHP, or a framework such as Laravel. Adding AJAX and JavaScript enables dynamic updates without page reloads.