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Method to return to a secondary directory by ID

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2016-07-25 09:07:051244browse
  2. /*
  3. Secondary directory
  4. Returns a secondary directory by ID, which is used to evenly distribute the content in 36*36 directories.
  5. 36 directories are a-z0-9
  6. */
  7. function IDcat($id){
  8. $p0 = $id % 1296;
  9. $p1 = ceil($p0 / 36)-1;
  10. $p2 = ($ p0-1) % 36 ;
  11. return IDnum($p1).'/'.IDnum($p2).'/';
  12. }
  13. function IDnum($i){
  14. if($i<10){
  15. if ($i==-1){
  16. return 'z';
  17. }else{
  18. return $i;
  19. }
  20. }else{
  21. return chr(87+$i);
  22. }
  23. }
  24. ?>
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