In which scenario would you typically enable the display of errors in PHP?

Enabling the display of errors in PHP is a common practice during application testing and debugging. In this phase of development, it is essential to identify and resolve any issues or bugs that may arise in the code. By displaying errors, developers can receive immediate feedback on what is going wrong, allowing them to quickly address issues, improve the code, and ensure that the application functions as intended.

During testing, developers often create scenarios that may trigger various types of errors, such as syntax errors, warnings, notices, or exceptions. Displaying errors informs the developer about these issues directly in the browser or console, facilitating a more efficient troubleshooting process.

In contrast, displaying errors in a production environment could expose sensitive information to users and lead to security vulnerabilities. For database queries, it is important to handle errors gracefully without revealing details to end-users. Similarly, while file uploads may require error handling, those errors should be logged rather than displayed to maintain a secure and professional user experience. Hence, displaying errors should primarily be reserved for development purposes rather than live environments.