1. Can you explain the difference between `include()` and `require()` in PHP, and when would you use each?

2. How do you handle errors and exceptions in PHP? Can you provide an example of custom exception handling?

3. Describe how you would optimize a PHP application for performance, especially when dealing with large databases or high traffic.

Question

1. Can you explain the difference between `include()` and `require()` in PHP, and when would you use each?
   
2. How do you handle errors and exceptions in PHP? Can you provide an example of custom exception handling?

3. Describe how you would optimize a PHP application for performance, especially when dealing with large databases or high traffic.

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