生成短连接的另一种方法

function shortUrl2($url){$result = sprintf("%u",crc32($url));$show = '';while($result  >0){$s = $result % 62;if($s > 35){$s=chr($s+61);}elseif($s>9 && $s<=35){$s=chr($s+55);}$show .= $s;$result = floor($result / 62);}return $show;}