Can I define and use custom exception hierarchy or inheritance in PHP?

Absolutely! You can definitely define and use a custom exception hierarchy or inheritance in PHP. It's a powerful feature that allows you to handle exceptions in a more organized and specific manner.

To define your own exception classes, you simply need to create a new class that extends the base `Exception` class. This way, your custom exception class will inherit all the properties and methods of the base class, enabling you to add any additional functionality or customization you require.

Here's a simple example to illustrate the process:

php
class MyCustomException extends Exception {

  // Additional code specific to your custom exception

}



class AnotherCustomException extends MyCustomException {

  // Additional code specific to another custom exception

}

php
throw new MyCustomException("Something went wrong!");

php
try {

  // Some code that may throw an exception

} catch (MyCustomException $e) {

  // Handle the exception

  echo "Custom exception caught: " . $e->getMessage();

}

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Absolutely! Custom exception hierarchy and inheritance in PHP can be a great way to enhance the error handling capabilities of your application.

To define a custom exception hierarchy, you can create multiple exception classes that extend the base `Exception` class. This allows you to divide your exceptions into specific categories based on the type of errors or situations you want to handle differently.

For instance, let's say you're building an e-commerce website and you want to have separate exceptions for different types of errors related to product management. You can create a base exception class called `ProductException`, which extends `Exception`, and then define more specific exception classes that inherit from `ProductException`.

Here's an example to illustrate this concept:

php
class ProductException extends Exception {

    // Additional code specific to product exceptions

}



class ProductNotFoundException extends ProductException {

    // Additional code specific to a product not found exception

}



class InvalidPriceException extends ProductException {

    // Additional code specific to an invalid price exception

}

php
if (!$product) {

    throw new ProductNotFoundException("Product not found!");

}



if ($price <= 0) {

    throw new InvalidPriceException("Invalid price!");

}

php
try {

    // Code that may throw a product exception

} catch (ProductNotFoundException $e) {

    // Handle product not found exception

    echo "Product not found: " . $e->getMessage();

} catch (InvalidPriceException $e) {

    // Handle invalid price exception

    echo "Invalid price: " . $e->getMessage();

} catch (ProductException $e) {

    // Handle generic product exception

    echo "Product exception: " . $e->getMessage();

}

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