PHP实现的62进制转10进制，10进制转62进制函数示例

function from62to10($str){
  $dict = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
  $len = strlen($str);
  $dec = 0;
  for($i = 0;$i<$len;$i++){
    //找到对应字典的下标
    $pos = strpos($dict, $str[$i]);
    $dec += $pos*pow(62,$len-$i-1);
  }
  return $dec;
}
echo from62to10('6r2HqO');
echo '<br>';
$dec = '5896401674';
function from10to62($dec) {
  $dict = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
  $result = '';
  do {
    $result = $dict[$dec % 62] . $result;
    $dec = intval($dec / 62);
  } while ($dec != 0);
  return $result;
}
echo from10to62($dec);