a) Interface
b) Object
c) Abstract class
d) Static class
Answer: a
Explanation: An interface in PHP consists of methods that have no implementations, i.e. the interface methods are abstract methods. The methods in the interfaces must have public visibility scope. The interfaces are different from classes as the class can inherit from one class only whereas the class can implement one or more interfaces.
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How many validation filters like FILTER_VALIDATE_EMAIL are currently available?
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