What are the advantages and disadvantages of using pre-built template systems like Smarty versus creating a custom template system in PHP?

When deciding between using a pre-built template system like Smarty or creating a custom template system in PHP, it's important to consider the advantages and disadvantages of each option. Advantages of using a pre-built template system like Smarty include faster development time, separation of business logic and presentation, and built-in security features. On the other hand, disadvantages may include a learning curve for beginners, limitations in customization, and potential performance overhead. Creating a custom template system in PHP allows for complete control over the design and functionality of the templates, as well as the ability to tailor the system to specific project requirements. However, this approach can be more time-consuming and may require more effort to maintain and update in the long run.