Backend Php Exceptions Interview Questions

try {
    throw new Exception("boom");
} catch (Exception $e) {
    echo "caught: " . $e->getMessage();
}

What is printed?

function run() {
    try {
        echo "A";
    } finally {
        echo "B";
    }
}
run();

What is printed?

In PHP 8, calling a function declared with strict_types=1 using an argument of the wrong type throws a TypeError. Does catch (Exception $e) catch a TypeError?

function parse(int $mode) {
    try {
        if ($mode === 1) throw new InvalidArgumentException("bad arg");
        if ($mode === 2) throw new RuntimeException("bad state");
        return "ok";
    } catch (InvalidArgumentException|RuntimeException $e) {
        return "handled: " . $e->getMessage();
    }
}
echo parse(2);

What is printed?

class NotFoundException extends Exception {}

try {
    throw new NotFoundException("user missing");
} catch (Exception $e) {
    echo get_class($e) . ": " . $e->getMessage();
}

What is printed?

A team wants callers to be able to catch a "user not found" failure specifically, separately from other generic errors.

class UserNotFoundException extends Exception {}

function findUser(int $id): array {
    if ($id === 0) {
        throw new UserNotFoundException("user $id not found");
    }
    return ["id" => $id];
}

try {
    findUser(0);
} catch (UserNotFoundException $e) {
    echo "specific: " . $e->getMessage();
} catch (Exception $e) {
    echo "generic: " . $e->getMessage();
}

What is printed?