I am new to php can any one explain why the ans is 10?

Question

function func($arg){
$result=0;
for($i=0;$i<$arg;$i++){
$result=$result+$i;
}
return $result;
}
echo func(5);

Answer 1

It's not just PHP but it is also the same with JavaScript

Answer 2

when i=0 0+0=0,
when i=1 0+1=1,
... 1+2=3,
... 3+3=6,
... 6+4=10

Answer 3

thank you Elizabeth & Siddharth

Answer 4

Now I expect the answer is 10.

Answer 5

btw s
what you expect?