PHP Interview Questions and answers

What will be the answer of the following code snippet?

echo 'Testing ' . 1 + 2 . '45';

Simply you will give the answer as : Testing 345

But the answer is : 245

That is because you can not sum a number with a string. The first part, before the plus mark is a string though there is 1 there.
So engine will simply get it as 0 and the latter part as 245. so answer will be 245.

Following question were asked in a technical php interview question paper

Which of the following will not combine strings $s1 and $s2 into a single string?


$s1 = 'a';
$s2 = 'b';
A. $s1 + $s2
B. "{$s1}{$s2}"
C. $s1.$s2
D. implode('', array($s1,$s2))
E. All of the above combine the strings

You can not concatenate 2 string using “+”. The answer will be “0″; so here the answer is A.