Try-catch execution flow in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a try block in PHP?

The try block contains code that might throw an exception. It lets you test code that could cause errors so you can handle them gracefully.

beginner

What happens when an exception is thrown inside a try block?

PHP stops running the try block and looks for a matching catch block to handle the exception. If found, it runs the catch block code.

beginner

What is the role of the catch block?

The catch block catches exceptions thrown in the try block. It lets you respond to errors, like showing a message or fixing the problem.

beginner

What happens if no exception is thrown in the try block?

The catch block is skipped, and the program continues running the code after the try-catch structure.

intermediate

What is the finally block used for in try-catch-finally?

The finally block runs code after try and catch, no matter what. It's good for cleanup tasks like closing files or connections.

What part of try-catch handles the error when an exception occurs?

A finally block

B try block

C catch block

D throw statement

The catch block is designed to handle exceptions thrown in the try block.

If no exception is thrown, which blocks run?

A try and finally

B try and catch

C try only

D catch only

If no exception occurs, the try block runs, and then the finally block runs if it exists.

What happens if an exception is thrown but no catch block matches it?

A The finally block runs and then the program stops

B The exception is ignored

C The program continues normally

D A fatal error occurs and the program stops

If no catch block matches, the finally block runs and then PHP throws a fatal error and stops execution.

Which block is optional in a try-catch-finally structure?

A try

B catch

C All are mandatory

D finally

The finally block is optional; try and catch are required to handle exceptions.

Where should you put code that must run regardless of exceptions?

A try block

B finally block

C catch block

D outside try-catch

The finally block always runs, making it ideal for cleanup code.

Explain the flow of execution in a try-catch-finally structure when an exception is thrown.

Think about what happens step-by-step when an error occurs.

Describe what happens if no exception occurs inside the try block.

Consider the normal flow without errors.