Answer Posted / rubina

The difference between the two is:
Var_dump() returns the datatype also of the variable which
print_r() does not.

Eg:
$query="Select fname from table where id=20";
$result=mysql_query($query);
$row=mysql_fetch_row($result);

print_r($query);
o/p
---------------
SELECT fname FROM information where id=53

var_dump($query);
o/p
----------------
string(43) " SELECT fname FROM information where id=53"

Binary tree question - Node has numeric data (int) The function takes depth as argument and sum all the value of the node of the depth. For instance, (0) depth 0 / \ 10 20 depth 1 / \ / \ 40 50 60 70 depth 2 so if you pass get_sum(2), you would return 220 which is 40+50+60+70 (sum of depth2) write the function.

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