$conn=mysql_connect("localhost","root","root")or dir("连接失败");
mysql_select_db("tb_demo",$conn);
$sql="select * from news";
$res=mysql_query($sql);
header("content-type:text/html;charset=utf-8");
echo "
新闻列表
";
echo "添加新闻
";
echo "";
echo "";
while($row=mysql_fetch_assoc($res)){
 echo "";
}
//上面的红色的地址本来该是show_news.php?act=look&id={$row['id']}
echo "
id
标题
查看详情
修改新闻
{$row['id']}
{$row['title']}
查看详情
修改页面
";
//关闭资源
mysql_free_result($res);
mysql_close($conn);

header("Content-type:text/html;charset=utf-8");
$conn=mysql_connect("localhost","root","root");
mysql_select_db("tb_demo",$conn);
mysql_query("set names utf8");
 $pa = $_SERVER['PATH_INFO'];
//$pa  打印出来的值是  /look-id-1.html
//通过正则表达式匹配获取的url地址
if(preg_match('/^\/(look)-(id)-([\d])\.shtml$/',$pa,$arr)){
 $act = $arr[1]; //这个是请求的look方法
 $id = $arr[3];  //这个是获取的id 值
 $sql="select * from news  where id= $id";
 $res=mysql_query($sql);
 $res = mysql_fetch_assoc($res);
 echo $res['title']."
".$res['content'];
}else{
 echo "url地址不合法";
}
mysql_close($conn);

#写你的rewrite规则
RewriteEngine On
# 可以配置多个规则，匹配的顺序是从上到下
RewriteRule  one_new-id-(\d+)\.shtml$ one_new.php?id=$1 //这里的$1 代表的是第一个参数啊
RewriteRule  abc_id(\d+)\.html$     error.php
#设置404错误
#ErrorDocument  404  /error.php