php game, formula to calculate a level based on exp

Question

Im making a browser based PHP game and in my database for the players it has a record of that players total EXP or experience.

What i need is a formula to translate

Answer 1

Google gave me this:

function experience($L) {
 $a=0;
  for($x=1; $x<$L; $x++) {
    $a += floor($x+300*pow(2, ($x/7)));
  }
 return floor($a/4);
}

for($L=1;$L<100;$L++) {
 echo 'Level '.$L.': '.experience($L).'
';
}

It is supposed the be the formula that RuneScape uses, you might me able to modify it to your needs. Example output:

Level 1: 0
Level 2: 55
Level 3: 116
Level 4: 184
Level 5: 259
Level 6: 343
Level 7: 435
Level 8: 536
Level 9: 649
Level 10: 773