Php function

Question

I have this code from one of the php questions in sololearn quiz:

<?php
function math($t){

if($t==0)
return 0;
return $t+ math($t-1);

}
echo math(6);

?>

The output is 21. Can somebody explain me step by step the result. I tried but i quit. :)

Thank you

Answer 1

i think it adds up all numbers 0 to n and outputs it
6+5+4+3+2+1=21
it uses recursion btw

Answer 2

thank you

Answer 3

yes..but this part i don t get: return $t + math($t-1)

Answer 4

if you noticed the name of function is math and math is used again in itself so everytime it runs local variable t gets 1 lower

Answer 5

razvan youre welcome ^-^