What are potential pitfalls of using short, easily guessable tokens for user authentication in PHP?

Using short, easily guessable tokens for user authentication in PHP can lead to security vulnerabilities such as token guessing attacks. To mitigate this risk, it is recommended to use long, randomly generated tokens for authentication purposes. This will make it significantly harder for attackers to guess or brute force the tokens.

// Generating a secure random token
$token = bin2hex(random_bytes(16)); // Generates a 32-character random token