a) Normal class
b) Static class
c) Abstract class
d) Interface
Answer: c
Explanation: The abstract classes are the classes in which at least one method need to be abstract. Abstract classes in PHP are declared with the help of keyword abstract. The use of class abstract are that all base classes implementing abstract class should give implementation of abstract methods declared in parent class.
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How many validation filters like FILTER_VALIDATE_EMAIL are currently available?
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