参考(caoxi)自 mcfx的回答 https://www.zhihu.com/question/381784377/answer/1099438784

正文

$table = 'fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF';
$tr = [];
for ($i = 0; $i !== 58; $i++){
    $tr[$table[$i]] = $i;
}
$s = [11,10,3,8,4,6];
$add = 8728348608;

function dec($x){
   global $tr,$s,$add;
    $r = 0;
    for ($i = 0; $i !== 6; $i++){
        $r += $tr[$x[$s[$i]]]*pow(58,$i);
   }
    return ($r-$add)^177451812;
}

function enc($x){
   global $add,$table,$s;
    $x = ($x^177451812) + $add;
    $r = 'BV1  4 1 7  ';
    for ($i = 0; $i !== 6; $i++){
      $k = floor($x/pow(58,$i)%58);
         $r[$s[$i]] = $table[$k];
  }
    return $r;
}
                      
print(dec('BV17x411w7KC')."\n");
print(dec('BV1Q541167Qg')."\n");
print(dec('BV1mK4y1C7Bz')."\n");
print(enc(170001)."\n");
print(enc(455017605)."\n");
print(enc(882584971)."\n");

输出

170001
455017605
882584971
BV17x411w7KC
BV1Q541167Qg
BV1mK4y1C7Bz

题外话

bv号很早就有了


小三转正了,23333333