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There are several ways PHP can be used to create a system for generating discount codes. Here are some steps you can follow:

1. Define the discount code generator: First, develop a function that generates a discount code. The code can be random strings or a combination of letters and numbers.

2. Store the discount code: You need to create a database to store the discount codes generated. You can use SQL or any other database management system.

3. Implement the discount code generator: To implement the discount code generator, you can develop a web application. The web application should have a form where users can enter their email addresses and other details. The application then generates a unique discount code and assigns it to the user.

4. Validate the discount code: You need to implement a validation function to ensure that users enter valid discount codes. The system should verify that the code entered exists in the database and is not expired.

5. Set the discount criteria: You can define how the discount code works in your system. You can set discounts based on the value of the purchase, number of items bought, or a percentage of the total amount.

6. Use the discount code: Finally, the user should be able to use the code at checkout. You need to develop a script that applies the discount to the order and updates the cart.

Overall, creating a discount code generator system requires expertise in PHP and database management. You need to ensure that the system is user-friendly, secure, and efficient.