Zend PHP 5.3 Certification 200-530 Question # 37 Topic 4 Discussion

Zend PHP 5.3 Certification 200-530 Question # 37 Topic 4 Discussion

200-530 Exam Topic 4 Question 37 Discussion:
Question #: 37
Topic #: 4

What is the difference between isset() and other is_*() functions (is_alpha(), is_number(), etc.)?


A.

isset() is a function call and is_*() are not function calls


B.

is_*() are language constructs and isset() is not a language construct


C.

c) isset() is a language construct and is_*() are not language constructs


D.

d) is_*() return a value whereas isset() does not


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