Please Explain me this code

Question

It shows 10 as a result But can u guys help me How it it please? Im a complete Noob
function func($arg) {
$result = 0;
for($i=0; $i<$arg; $i++) {
$result = $result + $i;
}
return $result;
}
echo func(5);

Answer 1

The argument 5 is passed to function func
so value of $arg becomes 5 ($arg=5)
for loop runs 5 times for value of $i=0 to $i=4....
the values of $i gets adding in $result
then look up 👆 @brains comment
@subhas FYI:- if u see brains in play section don't challenge 😂😂😂😂

Answer 2

1+2+3+4=10

Answer 3

0+1+2+3+4 = 10

Answer 4

Thx a lot Guys