<?php
/*
php严程序 - php教程：http://www.phpyan.com
课程包含：
php高级篇、mysql高级篇、面向对象、XML、HTTP协议、AJAX、Linux、memcached...

本案例开发思路：http://www.phpyan.com/home/article/350.html
*/

/*
ajax调用本文件不断向服务器索要数据.如果成功后.break退出循环.
还没完,服务器返回以后.ajax再次调用继续索取
*/

if (!isset($_COOKIE['pos'])){
	exit();
}

set_time_limit(0);

require 'conn.php';
$pos = htmlspecialchars($_COOKIE['pos']);

while (true){
	$sql = 'select id,content from liao where isread=1 and rec="'.$pos.'" order by id desc limit 1';
	$rs = mysql_query($sql,$conn);
	$find = mysql_fetch_assoc($rs);
	if ($find){
		$setRead = 'update liao set isread=0 where id='.$find['id'];
		mysql_query($setRead,$conn);
		echo json_encode($find);
		break;
	}
	
	sleep(1);
}

?>