- <?php
- function dec2s4($dec) {
- $base = '0123456789:;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
- $result = '';
- do {
- $result = $base[$dec % 64] . $result;
- $dec = intval($dec / 64);
- } while ($dec != 0);
- return $result;
- }
- function s42dec($sixty_four) {
- $base_map = array (
- '0' => 0,
- '1' => 1,
- '2' => 2,
- '3' => 3,
- '4' => 4,
- '5' => 5,
- '6' => 6,
- '7' => 7,
- '8' => 8,
- '9' => 9,
- ':' => 10,
- ';' => 11,
- 'a' => 12,
- 'b' => 13,
- 'c' => 14,
- 'd' => 15,
- 'e' => 16,
- 'f' => 17,
- 'g' => 18,
- 'h' => 19,
- 'i' => 20,
- 'j' => 21,
- 'k' => 22,
- 'l' => 23,
- 'm' => 24,
- 'n' => 25,
- 'o' => 26,
- 'p' => 27,
- 'q' => 28,
- 'r' => 29,
- 's' => 30,
- 't' => 31,
- 'u' => 32,
- 'v' => 33,
- 'w' => 34,
- 'x' => 35,
- 'y' => 36,
- 'z' => 37,
- 'A' => 38,
- 'B' => 39,
- 'C' => 40,
- 'D' => 41,
- 'E' => 42,
- 'F' => 43,
- 'G' => 44,
- 'H' => 45,
- 'I' => 46,
- 'J' => 47,
- 'K' => 48,
- 'L' => 49,
- 'M' => 50,
- 'N' => 51,
- 'O' => 52,
- 'P' => 53,
- 'Q' => 54,
- 'R' => 55,
- 'S' => 56,
- 'T' => 57,
- 'U' => 58,
- 'V' => 59,
- 'W' => 60,
- 'X' => 61,
- 'Y' => 62,
- 'Z' => 63,
- );
- $result = 0;
- $len = strlen($sixty_four);
- for ($n = 0; $n < $len; $n++) {
- $result *= 64;
- $result += $base_map[$sixty_four{$n}];
- }
- return $result;
- }
- echo s42dec(dec2s4(0));
- echo s42dec(dec2s4(10));
- echo s42dec(dec2s4(63));
- echo s42dec(dec2s4(64));
- echo s42dec(dec2s4(111));