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What is an Interface in PHP? PHP interfaces are abstract contracts that define a set of methods that must be implemented by any class that implements them. They are used to specify a common set of methods that can be called by other parts of a program, without worrying about the details of how those methods are implemented.
Definition and Purpose An interface in PHP is defined using the interface keyword, followed by the name of the interface and a list of methods that must be implemented. The purpose of an interface is to define a contract that must be.
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