php短网址.txt文件如何改写为长尾词？

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plaintext短网址生成函数：javascriptfunction urlShort($url) { $url=crc32($url); $result=sprintf(%u, $url); $sUrl=''; while ($result) { $s=$result % 62; if ($s > 35) { $s=chr($s + 61); } elseif ($s > 9) { $s=chr($s + 55); } else { $s=chr($s + 48); } $sUrl=$s . $sUrl; $result=floor($result / 62); } return $sUrl;}

短网址.txt

function urlShort($url){ $url= crc32($url); $result= sprintf("%u", $url); $sUrl= ''; while($result>0){ $s= $result%62; if($s>35){ $s= chr($s+61); } elseif($s>9 && $s<=35){ $s= chr($s+ 55); } $sUrl.= $s; $result= floor($result/62); } return $sUrl; } $url = 'www.sharefamily.net'; $sUrl = urlShort($url); echo '网址：'.$url."\n\n"; echo '短网址：'.$sUrl."\n\n";