[RESOLVED] Need help with PHP & maths functions

[Jazz00006]

Well, I have this code,

$a = 0; 
$goal2 = $goal - 1;
for ($x = 1;  $x <= $goal2; $x += 1) {
  $a = $a + intval($x + 300 * (2 ^ ($x / 7)));
  echo $a.'<BR>';
}
  $xp2 = intval($a / 4) - $xp;
echo $xp2; 

and apart from the echos, it is completly wrong

Heres a sample: Clicky Me

and from 1 -> 99 the output should be this:

0
83
174
276
388
512
650
801
969
1154
1358
1584
1833
2107
2411
2746
3115
3523
3973
4470
5018
5624
6291
7028
7842
8740
9730
10824
12031
13363
14834
16456
18247
20224
22406
24815
27473
30408
33648
37224
41171
45529
50339
55649
61512
67983
75127
83014
91721
101333
111945
123660
136594
150872
166636
184040
203254
224466
247886
273742
302288
333804
368599
407015
449428
496254
547953
605032
668051
737627
814445
899257
992895
1096278
1210421
1336443
1475581
1629200
1798808
1986068
2192818
2421087
2673114
2951373
3258594
3597792
3972294
4385776
4842295
5346332
5901831
6517253
7195629
7944614
8771558
9684577
10692629
11805606
13034431

And for those who know VB6, this is the original function:

Public Function ExperienceNeededToGoalLevel(ByVal YourXP As Double, GoalLvl As Integer) As Double
   Dim a As Long
   Dim x As Long
   GoalLvl = GoalLvl - 1
   For x = 1 To GoalLvl
       a = a + Int(x + 300 * (2 ^ (x / 7)))
   Next
   ExperienceNeededToGoalLevel = Int(a / 4) - YourXP
End Function

I tried to modify it so it works with PHP, but the numbers are always off, is there something i am missing?


Cheers