Restructuring

solutions/ProjectEuler/015/solve.php

@@ -0,0 +1,11 @@
+<?php
+define('GRID_SIZE',20);
+function factorial($num) {
+	if($num == 0) 
+		return 1;
+	else 
+		return bcmul($num,factorial(bcsub($num,1)));
+}
+
+echo bcdiv(factorial(2* GRID_SIZE),bcpow(factorial( GRID_SIZE),2));
+