<?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); ?>