Abstract methods of object model exploration in PHP5.0 and abstract class PHP Learning Network. The object-oriented program is built through the layered structure of the class. in a single repeated language such as PHP, the class continues to be tree-like. A root class has one or more sub-classes. then, from each sub-class, the object-oriented program is built through the hierarchical structure of the class. in the single-repeating language such as PHP, the class continues to be tree-like. A root class has one or more sub-classes, and then one or more sub-classes continue from each sub-class. Of course, there may be multiple root classes to implement different functions. In a well-designed system, each root class should have a useful interface that can be used by application code. If our application code is designed to work with the root class, it can also work with any subclass that continues from the root class.
An abstract method is a placeholder of a method as in a subclass (which occupies a place but does not work). it is different from a general method.
Exist. a root class has one or more subclasses, and then continues from each subclass...
