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You want to design a system where different payment methods (like PayPal, CreditCard) must implement a 'pay' method. How does using an interface help in this scenario?

hard📝 Application Q8 of 15
PHP - Interfaces and Traits
You want to design a system where different payment methods (like PayPal, CreditCard) must implement a 'pay' method. How does using an interface help in this scenario?
AIt automatically processes payments without class code
BIt allows storing payment data directly in the interface
CIt forces all payment classes to implement the 'pay' method, ensuring consistency
DIt lets classes inherit payment logic without writing methods
Step-by-Step Solution
Solution:
  1. Step 1: Understand the need for consistent method

    All payment classes must have a 'pay' method to process payments uniformly.
  2. Step 2: Role of interface

    Interface defines 'pay' method signature, forcing classes to implement it.
  3. Final Answer:

    It forces all payment classes to implement the 'pay' method, ensuring consistency -> Option C
  4. Quick Check:

    Interface enforces method implementation [OK]
Quick Trick: Interfaces enforce required methods across classes [OK]
Common Mistakes:
  • Thinking interfaces store data
  • Assuming interfaces run code automatically
  • Believing inheritance replaces interfaces

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