In what situations would it be necessary to store PHP code in a database, and what alternatives should be considered?

Storing PHP code in a database may be necessary in situations where dynamic code execution is required based on user input or configuration settings. However, this approach can introduce security risks and make code maintenance challenging. Alternatives to consider include storing code snippets in separate files, using a template engine for dynamic content, or utilizing a content management system for managing dynamic content.

// Example of storing PHP code in a database and executing it
// Assume $code contains the PHP code retrieved from the database

eval($code);