php生成短网址

复制代码 代码如下:

<?php

$chars=array("a","b","c","d","e","f","g","h",

"i","j","k","l","m","n","o","p",

"q","r","s","t","u","v","w","x",

"y","z","0","1","2","3","4","5",

"6","7","8","9","A","B","C","D",

"E","F","G","H","I","J","K","L",

"M","N","O","P","Q","R","S","T",

"U","V","W","X","Y","Z");

$salt="www.joneto.com";

$hash=md5("http://www.sina.com".$salt);

$rs=array();

for($i=0;$i<4;$i++){

$temp=substr($hash, $i*8,8);

$temp=base_convert($temp, 16, 10) & base_convert("3fffffff", 16, 10);

$str="";

for($j=0;$j<6;$j++){

$subtemp=$temp & intval(base_convert("3d", 16, 10));

$str.=$chars[$subtemp];

$temp=$temp>>5;

}

unset($temp);

$rs[]=$str;

}

print_r($rs);

?>