Refactor complex Laravel business rules with the Specification Pattern

Short summary

A practical tutorial on implementing the Specification Pattern in Laravel to eliminate duplicated business rules between Eloquent queries and in-memory PHP checks. It walks through a VIP discount eligibility example, showing how naive approaches lead to code duplication and model bloat. The proposed solution creates isolated, reusable specification classes implementing both isSatisfiedBy and apply methods for a KISS-compliant design.

• •Specification Pattern turns business rules into first-class reusable classes with both query and in-memory checks
• •Naive Laravel approaches duplicate logic between Eloquent scopes and PHP if-else blocks
• •Tutorial includes a PHP 8.5+ interface definition and a concrete IsVipCustomer specification example

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