31. Atleast how many abstract methods must an abstract class contain?
32. Which one of the following keyword is used to implement an interface?
33. Which version of PHP introduced the concept called late static binding?
34. Which one of the following methods in the exception class, is used to get a nested exception object?
35. Which one of the following keyword is used in conjunction with an Exception object?
36. Which keyword is used to put a stop on inheritance?
37. PHP provides built-in interceptor methods, which can intercept messages sent to undefined methods and properties. This is also known as _________
38. Which one of the following method is invoked when a value is assigned to an undefined property?
39. Which one of the following method is invoked when an undefined method is called by client code?
40. Which method introduced in PHP 5, is invoked just before an object is garbage collected?
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