for loop - PHP Fibonacci Sequence -

this php method suppose print fibonacci sequence specified value using loop. unsure why not work?

<?php function fib ($n) { // function called fib, declaire variable n (the sequence number)     ($n=0;$n<30;$n++) {         if ($n < 3) { return $n; } // if n smaller 3 return n (1 or 2)         else { return fib ($n - 1) + fib ($n - 2); }      /* if number 3 or above 2 sums (n-1) , (n-2)     , add 2 sums (n-1)+(n-2)     example fibonacci number 4     (4-1)+(4-2) = 5     3 + 2 = 5     */ } print $n; ?> 

there way calculate fibbonacci number without iteration using rounding:

http://en.wikipedia.org/wiki/fibonacci_number#computation_by_rounding

function getfib($n) {     return round(pow((sqrt(5)+1)/2, $n) / sqrt(5)); }