PHP/interface

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About

In PHP, an interface is a set of public method-functions which can be required in either of two circumstances:

  • in the declaration of a class
    • This works almost identically to declaring the interface's methods as abstract functions in a trait or parent class.
  • the type of a function argument or return value
    • Advantages over declaring the object as a class:
      • narrows down (more closely specifies) the function's expectations of a passed or returned object
      • does not tie the object to a specific class hierarchy

Functions

  • interface_exists() returns TRUE if the interface has been declared in code that has executed.

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