&lt;?phpdefine&#40;'IF', 42&#41;; echo &quot;IF: &quot;, IF;?&gt;
A. IF:42
B. no output
C. IF:
D. ERROR
Answer:A
&lt;?phpdefine&#40;'IF', 42&#41;; echo &quot;IF: &quot;, IF;?&gt;
A. IF:42 B. no output C. IF: D. ERROR
Explanation: Keyword like IF cannot be used as constant names.