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🔍 Frequently Asked Questions (FAQ)
1. When should a team choose a monolith over microservices?
A monolith is often the better choice when teams need rapid iteration, low coordination overhead, and a simple deployment model. It works well when the domain is still evolving and boundaries are not fully understood. A well-structured monolith can scale effectively if coupling is carefully managed. Architectural success depends more on dependency clarity than on service count.
2. How does coupling impact system complexity and maintainability?
Coupling increases complexity when changes in one component require changes in others. Tight coupling makes systems fragile, harder to test, and more difficult to refactor safely. Hidden coupling—especially through shared databases or reused abstractions—creates long-term maintenance risks. Managing coupling explicitly is essential for sustainable architecture.
3. Do microservices eliminate coupling or just move it?
Microservices reduce direct code-level dependencies but introduce communication-level dependencies. Synchronous APIs create runtime availability coupling, while asynchronous systems require shared understanding of message contracts. Versioning and inter-service coordination can become complex over time. Microservices shift coupling into communication patterns rather than removing it entirely.
4. How can coupling be reduced inside a monolith without rewriting it?
Coupling can be reduced by organizing code around domains instead of technical layers. Enforcing internal visibility rules prevents unrelated domains from directly accessing each other’s logic. Using event dispatching makes dependencies explicit rather than implicit. Clear boundaries inside a single codebase can provide many benefits associated with microservices.
5. What are satellite services and when are they useful?
Satellite services are independent services that extend a monolith with one-directional data flow. They handle specialized tasks such as data ingestion, transformation, or external integration without creating bidirectional dependencies. This avoids complex versioning meshes between services. Satellite services combine infrastructure flexibility with architectural simplicity.
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🔍 Frequently Asked Questions (FAQ)
1. What are the risks of using "magic strings" in PHP?
Magic strings are untyped string literals with implicit meaning. They offer no IDE support or compile-time validation, leading to bugs when typos occur. PHP treats these strings as valid, making bugs silent and hard to detect.
2. How do Enums improve code safety in PHP 8.1?
Enums replace unstructured magic strings with type-safe, native constructs. They allow strict type hinting, meaning invalid values like typos cause immediate errors. This shifts validation from runtime to compile time.
3. How can PHP Enums centralize domain logic for better UI consistency?
PHP Enums can include methods like label(), which return consistent display values across UI components. This reduces scattered label logic and prevents mismatches when terms change.
4. What is the benefit of readonly properties and classes in PHP 8.1/8.2?
Readonly enforces immutability after object construction. This prevents accidental mutations of objects, catching logic errors that could otherwise silently corrupt application state.
5. Why are Union and Intersection Types important in modern PHP?
Union types allow functions to accept multiple types explicitly, while intersection types require parameters to satisfy multiple interfaces. These enforce precise, self-documenting contracts and reduce silent failures from incorrect input.
6. What problems do switch statements introduce in PHP?
Traditional switch statements allow fall-through and use loose comparisons, leading to subtle bugs. Missing break statements or unintended type coercions can cause incorrect logic flow.
7. How does the match expression improve control flow in PHP 8.0?
Match uses strict comparison (===) and enforces exhaustive handling. It avoids fall-through bugs and guarantees that unmatched cases result in a compile-time error, making failures obvious and fixable.
8. What do named arguments solve in legacy PHP function calls?
Named arguments improve readability and refactor-safety by allowing parameters to be passed by name. This eliminates ambiguity, especially in functions with many optional or boolean parameters.
9. How does Constructor Property Promotion reduce boilerplate in PHP 8.0?
This feature combines property declaration and constructor assignment into a single line. It makes code more concise and reduces the likelihood of errors from duplicated variable declarations.
10. What is the purpose of the #[Override] attribute in PHP 8.3?
#[Override] ensures that a method is truly overriding a parent method. If the method in the parent is missing or renamed, PHP throws a fatal error, preventing silent logic failures due to inheritance bugs.
