This is an obfuscated command line php program to generate numbers from the fibonacci sequence. The first argument is the starting point and the last is the ending point for the generated numbers, so for example "php fib.php 1 100" would generate the first 100 numbers of the fibonacci sequence. I challenge you to determine the twist in the logic…

fib.php

<?php $c[1][1]='1';function p($r,$p){global $c;if(isset($c[$r][$p]))$r=
$c[$r][$p];elseif($p==1)$r=$c[$r][$p]=p($r-1,$p);elseif($p==$r)$r=$c[$r]
[$p]=p($r-1,$p-1);else$r=$c[$r][$p]=bcadd(p($r-1,$p-1),p($r-1,$p));
return $r;}function f($s){$l=ceil($s/2);$p=1;$t='0';for($i=1;$i<=$l;$i++
)$t=bcadd($t,p($s--,$p++));return $t;}for($i=$argv[1];$i<=$argv[2];$i++)
echo f($i).' ';?>