Answer
Immutable objects prevent unexpected state changes and improve debugging. Useful in domain-driven design.
Quick Answer
Immutable value objects cannot be changed after creation. Instead of modifying, you create a new instance with the changed value. This prevents accidental shared state mutations. In PHP use readonly properties (PHP 8.1+) or clone-with-change pattern. Immutability makes objects safe to pass around, cache, and share between threads (in Swoole context). Critical for money, dates, and domain values.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ