Which one of the following keywords is used to define an abstract class?
A. extends
B. implements
C. abstract
D. new
Answer:A
Which one of the following keywords is used to define an abstract class?
A. extends B. implements C. abstract D. new
Explanation: The introduction of abstract classes was one of the major changes ushered in with PHP 5. Its inclusion in the list of new features was another sign of PHP’s extended commitment to object-oriented design.