Throwing exceptions in PHP - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this PHP code with exception?

Look at the code below. What will it output when run?

PHP

<?php
function test() {
    try {
        throw new Exception("Error happened");
    } catch (Exception $e) {
        return $e->getMessage();
    }
}
echo test();
?>

A Exception

B Error happened

C Fatal error

D No output

💡 Hint

The catch block returns the exception message.

The function throws an exception, which is caught immediately. The catch block returns the message 'Error happened', which is then printed.

❓ Predict Output

intermediate

What error does this PHP code raise?

What error will this code produce when run?

PHP

<?php
function example() {
    throw new Exception("Oops");
}
example();
echo "Done";
?>

A Parse error

B Done

C No output

D Uncaught Exception: Oops

💡 Hint

There is no try-catch block to handle the exception.

The function throws an exception but it is not caught, so PHP stops execution and shows an uncaught exception error.

🔧 Debug

advanced

Why does this PHP code cause a fatal error?

This code tries to throw an exception but causes a fatal error. Why?

PHP

<?php
try {
    throw new Exception("Fail");
} catch (Error $e) {
    echo "Caught error";
}
?>

A Because Exception class is undefined

B Because catch block is empty

C Because Exception is not caught by catch(Error $e)

D Because throw syntax is wrong

💡 Hint

Exception and Error are different classes in PHP.

The catch block only catches Errors, but the thrown object is an Exception, so it is not caught and causes a fatal error.

📝 Syntax

advanced

Which option correctly throws and catches an exception?

Choose the code snippet that correctly throws and catches an exception in PHP.

A <?php try { throw new Exception("Error"); } catch (Exception $e) { echo $e->getMessage(); } ?>

B <?php try { throw new Exception("Error") } catch Exception $e { echo $e->getMessage(); } ?>

C <?php try { throw new Exception("Error"); } catch (Exception $e) echo $e->getMessage(); ?>

D <?php try { throw new Exception("Error"); } catch (Exception $e) { echo $e->message; } ?>

💡 Hint

Check for correct syntax: semicolons, parentheses, and method calls.

Option A uses correct try-catch syntax with semicolons and calls getMessage() method properly. Others have syntax errors or wrong method usage.

🚀 Application

expert

How many items are in the array after exception handling?

What is the number of elements in the array $results after running this code?

PHP

<?php
$results = [];
try {
    $results[] = 1;
    throw new Exception("Stop");
    $results[] = 2;
} catch (Exception $e) {
    $results[] = 3;
}
$results[] = 4;
print_r($results);
?>

A 3

B 5

C 2

D 4

💡 Hint

Remember that code after throw inside try is skipped.

The array gets 1 before exception, then 3 in catch, then 4 after try-catch. So total 3 elements.