I
- implements
The keyword that replaces extends when inheriting an interface rather than a class
- inheritance
The ability of an OO language to pass the methods and data members of an existing class on to a new class
- instance
A specific occurrence of a class; creation of a class object is referred to as instantiation
- interface
1. A keyword in PHP indicating a class that declares methods but does not define them. PHP allows multiple interfaces to be inherited. 2. The public methods of a class.
- Iterator
An interface, built in to PHP 5, that allows objects to be traversed
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