One Possible Solution for Loading Config into a Service from an Array

This pattern demonstrates how to build a reusable, property-based config system for services in PHP, with automatic validation of required and optional parameters.

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ServiceException

A generic exception class used for signaling configuration or service errors.
You can replace this with a more specific exception class depending on your application needs.

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BaseConfig

An abstract config class providing generic logic for:

• Loading configuration from an array
• Validating required parameters
• Applying default values for optional parameters
• Casting values to the correct type

Child classes are required to define:

• serviceName — a string identifier for the service
• requiredParams — an array of required parameter names and types
• optionalParams — an array of optional parameters with type and default value

The BaseConfig constructor automatically assigns values to typed, readonly properties in the child class.

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StripeConfig

An example of a concrete config class for a hypothetical Stripe service.

• Declares the necessary readonly properties
• Specifies required and optional parameters
• Inherits validation and type casting logic from BaseConfig

$stripeConfig = new StripeConfig([
    'api_key' => 'sk_test_123',
    'endpoint' => 'https://api.stripe.com',
]);