&lt;?php$a = 12;--$a;echo $a++;?&gt;
A. 11
B. 12
C. 10
D. error
Answer:A
&lt;?php$a = 12;--$a;echo $a++;?&gt;
A. 11 B. 12 C. 10 D. error
Explanation: The + operator does union of arrays in that order, then the === operator compares key and value pairs.