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A statically-typed language is a language (such as Java, C, or C++) where variable types are known at compile time. In most of these languages, types must be expressly indicated by the programmer; in other cases (such as OCaml, Javascript), type inference allows the programmer to not indicate their variable types. Reference: Mozilla

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Why does PHP have interfaces?

Interfaces allow you to implement the open-closed principle, maintain a loosely coupled code base, and implement many of the best OOP design patterns. For instance, if one class accepts another class …
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