<?php

$activity_id=$_POST['id'];

$user_name=$_POST['user_name'];

$content=$_POST['content'];

$link=mysql_connect("localhost:3306","root") or die(mysql_error());

mysql_select_db("activity");

$sql="insert into comment values(null,'$activity_id','$user_name',default,'$content')";

$result=mysql_query($sql) or die(mysql_error());

mysql_close($link);

if($result){

echo "<script type='text/javascript'>alert('留言发表成功！');location.href='show.php?id=$activity_id'</script>";

}

else echo "发生了错误";

?>