JQuery 经典实例

<?php // 配置信息： // 1,数据库连接的具体信息 // 2,我们要存储的消息的数目 // 3,用户进到聊天室的时候消息显示的数目 $dbhost = "localhost"; $dbuser = "root"; $dbpass = "root"; $dbname = "chat"; $store_num = 10; $display_num = 10; // 错误报告 error_reporting(E_ALL); // 头部信息 header("Content-type: text/xml"); header("Cache-Control: no-cache"); //连接mysql $dbconn = mysql_connect($dbhost,$dbuser,$dbpass); mysql_select_db($dbname,$dbconn); //为容易操作请求数据,我们为请求中的每个参数设置一个变量,每个变量将把请求中的参数值作为其自己的值 //foreach语句遍历所有的POST数据,并且为每个参数创建一个变量,并且给它赋值 foreach($_POST as $key => $value){ $$key = mysql_real_escape_string($value, $dbconn); } //屏敝任何错误提示,判断action是否等于 postmsg if(@$action == "postmsg"){ //插入数据 mysql_query("INSERT INTO messages (`user`,`msg`,`time`) VALUES ('$name','$message',".time().")",$dbconn); //删除数据(因为我们默认值存储10条数据) mysql_query("DELETE FROM messages WHERE id <= ". (mysql_insert_id($dbconn)-$store_num),$dbconn); } //查询数据 $messages = mysql_query("SELECT user,msg FROM messages WHERE time>$time ORDER BY id ASC LIMIT $display_num",$dbconn); //是否有新记录 if(mysql_num_rows($messages) == 0) $status_code = 2; else $status_code = 1; //返回xml数据结构 echo "<?xml version=\"1.0\"?>\n"; echo "<response>\n"; echo "\t<status>$status_code</status>\n"; echo "\t<time>".time()."</time>\n"; if($status_code == 1){ //如果有记录 while($message = mysql_fetch_array($messages)){ $message['msg'] = htmlspecialchars(stripslashes($message['msg'])); echo "\t<message>\n"; echo "\t\t<author>$message[user]</author>\n"; echo "\t\t<text>$message[msg]</text>\n"; echo "\t</message>\n"; } } echo "</response>"; ?>