An interface in PHP establishes a contract that a class must adhere to. It serves as a blueprint for defining classes, akin to how classes define objects. Implementing a specific interface guarantees consistent behavior regarding method calling, arguments, and return types.
Programmers can define the required public methods that a class must implement through interfaces, abstracting the implementation details. Interfaces act as a higher level of abstraction, much like abstract classes, focusing solely on method prototypes without data variables.
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