What are the best practices for structuring databases to avoid using ID numbers for data differentiation in PHP?

Using ID numbers for data differentiation can lead to potential security vulnerabilities and make it easier for attackers to guess or manipulate data. To avoid this, it's best practice to use unique identifiers or composite keys based on the actual data attributes. This can help ensure data integrity and prevent unauthorized access to sensitive information.

// Example of structuring a database table without using ID numbers for data differentiation
CREATE TABLE users (
    username VARCHAR(50) PRIMARY KEY,
    email VARCHAR(100) UNIQUE,
    password VARCHAR(255)
);