Managing user permissions is a critical aspect of web application development. Proper access control ensures that users only interact with data and features they are authorized to use. A well-structured permission system enhances security, prevents data breaches, and improves usability.

Two-factor authentication (2FA) has become a cornerstone of online security. It provides an extra layer of protection by requiring users to verify their identity in two ways—typically, something they know (a password) and something they have (a code sent to their phone). But implementing 2FA effectively requires balancing security with user convenience. Here’s a look at when and why you should prompt for 2FA, with specific timing recommendations and examples, including how to implement checks using PHP.