To create an e-commerce website with PHP, follow these steps:

1. Set up your development environment: Install a local web server (such as XAMPP or WAMP) and a code editor (such as Visual Studio Code or Sublime Text).

2. Database setup: Create a MySQL database to store product information, user details, and orders. You can use phpMyAdmin or the command line to create the database and required tables.

3. Design the layout: Create a layout for your e-commerce website using HTML and CSS. Consider using bootstrap or other CSS frameworks to make the website responsive and user-friendly.

4. Create PHP files: Create separate PHP files for different pages of your e-commerce website, such as home.php, products.php, cart.php, etc. Add the necessary PHP code to connect to the database and retrieve data.

5. Implement user authentication: Allow users to create an account, log in, and log out using PHP session management. Store user details securely in the database, including passwords that are hashed for security.

6. Display products: Fetch product data from the database and display them on the products.php page. Allow users to add products to their cart using HTML forms and PHP code.

7. Implement cart functionality: Create a shopping cart functionality using sessions or cookies to store product information. Allow users to add or remove items from their cart and view the cart contents.

8. Process orders: Create a checkout page where users can review their cart items and enter their shipping information. Calculate the total amount and store the order details in the database.

9. Implement payment gateway integration: Integrate a payment gateway (such as PayPal or Stripe) to handle secure online payments. Follow the documentation provided by the payment gateway provider to set up the integration.

10. Handle order confirmation and emails: Send order confirmation emails to the user and the store owner, including order details and shipping information. Update the order status in the database once the payment is successful.

11. Implement order history: Allow logged-in users to view their order history, including past orders and their order status.

12. Security considerations: Implement security measures to protect user data, including input validation, secure password storage, and protection against SQL injection and cross-site scripting (XSS) attacks.

13. Test and deploy: Test your e-commerce website thoroughly to ensure all features are working as expected. Once you are satisfied, deploy the website to your hosting environment or a cloud server.

Remember to regularly update and maintain your e-commerce website to ensure security and usability improvements.