PHP入门

生成短网址程序

<?php
function code62($x){
 $show='';
 while($x>0){
  $s=$x % 62;
  if ($s>35){
   $s=chr($s+61);
  }elseif($s>9&&$s<=35){
   $s=chr($s+55);
  }
  $show.=$s;
  $x=floor($x/62);
 }
 return $show;
}
function shorturl(http://pic4.phprm.com/2013/06/15/$url.jpg){
 $url=crc32($url);
 $result=sprintf("%u",$url);
 return code62($result);
}