AW: AW: [php] Lange Zahl kürzen (umrechnen) [kein RegEx]

[Andre Gemünd]

Michael Schoenboeck wrote:
> Hi reinhold,
> 
> Also heut is DI und ich bin immer noch nich weiter :)

$charset = array(
       0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
       'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
       'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
       'u', 'v', 'w', 'x', 'y', 'z',
       'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
       'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
       'U', 'V', 'W', 'X', 'Y', 'Z',
       '_'
);

function encode($number) {
   global $charset;
   $divisor = count($charset);
   $komponenten = array();
   while ($number > $divisor) {
     $factors[] = $number % $divisor;
     $number = $number / $divisor;
   }
   $factors[] = floor($number);
   $result = "";
   foreach ($factors as $factor) {
     $result .= $charset[$factor];
   }
   return $result;
}

function decode($string) {
   global $charset;
   $result = 0;
   for ($i = 0; $i < strlen($string); $i++) {
     $factor = array_keys($charset, $string[$i]);
     $result += $factor[1] * pow(63, $i);
   }
   return $result;
}

Gruß
André