<&#63;php
//sha1_en.php
header("content-tyPE:text/htML;charset=utf-8");
$str = "我是张三，能给我个人数据吗";
$salt="123456";//我是唯一不变的salt
$sha1=sha1($str.$salt);//或者$sha1=md5($str.$salt);
echo $str;
echo "<br/>";
echo $sha1;
echo "<br/>";
echo "http://localhost//sha1_de.php?str=$str&amp;sha1=$sha1";
?>

<?php
//sha1_de.php
header("content-type:text/html;charset=utf-8");
$str=$_GET["str"];
$sha1=$_GET["sha1"];
$salt="123456";//我是唯一不变的salt
$verify=sha1($str.$salt);//或者$verify=md5($str.$salt);
echo $verify;
if($verify==$sha1){
  echo "你是张三，给你信息";
}else{
  echo "你是假冒伪劣产品";
  echo "你的ip".$_SERVER['REMOTE_ADDR']."已经被记录了";
}
?>