PHP Custom Exceptions

Build granular exception hierarchies for robust domain error handling.

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Custom exceptions extend PHP's built-in Exception class. They allow catch blocks to handle specific domain failures (e.g. payment failure vs invalid user ID) distinctly.

Key Takeaways: PHP Custom Exceptions

Mastering PHP Custom Exceptions helps you write clean and reliable PHP code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

PHP Custom Exceptions Code Example

PHP

class InsufficientBalanceException extends Exception {}

function debit($balance, $amount) {
    if ($amount > $balance) {
        throw new InsufficientBalanceException("Cannot debit amount: balance too low.");
    }
    return $balance - $amount;
}

try {
    debit(100, 250);
} catch (InsufficientBalanceException $e) {
    echo $e->getMessage();
}

Output

Cannot debit amount: balance too low.

Run this example on your own computer. The "Get Started" lesson shows how to set it up.

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PHP Custom Exceptions

💡 Key Takeaways: PHP Custom Exceptions

PHP Custom Exceptions Code Example

Key Takeaways: PHP Custom Exceptions