A PHP function to generate short URLs

<?php  
/** 
 * 短网址 
 */  
   
function urlShort($url){  
    $url= crc32($url);  
    $result= sprintf("%u", $url);  
    $sUrl= &#39;&#39;;  
    while($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 = &#39;www.qttc.net&#39;;  
$sUrl = urlShort($url);  
   
echo &#39;<meta charset="utf-8" />&#39;;  
echo &#39;网址：&#39;.$url.&#39;<br />&#39;;  
echo &#39;短网址：&#39;.$sUrl;  
   
?>