PHP+jQuery实现滚屏无刷新动态加载数据功能详解

<?php
require_once('connect.php'); //连接数据库
$user = array('demo1','demo2','demo3','demo3','demo4');
$page = intval($_GET['page']); //获取请求的页数
$start = $page*15;
$query=mysqli_query($link, "select * from say order by id desc limit $start,15");
/* while ($row=mysqli_fetch_array($query)) {
  $arr[] = array(
    'content'=>$row['content'],
    'author'=>$user[$row['userid']],
    'date'=>date('m-d H:i',$row['addtime'])
  );
} */
if($query){
  while ($row=mysqli_fetch_array($query)) {
    $arr[] = array(
      'content'=>$row['content'],
      'author'=>$user[$row['userid']],
      'date'=>date('m-d H:i',$row['addtime'])
    );
  }
}
if(!empty($arr)){
  echo json_encode($arr); //转换为json数据输出
}
//echo json_encode($arr); //转换为json数据输出
?>

<?php
$host="localhost";
$db_user="root";
$db_pass="admin";
$db_name="ajax_demo";
$timezone="Asia/Shanghai";
$link=mysqli_connect($host,$db_user,$db_pass);
mysqli_select_db($link, $db_name);
mysqli_query($link, "SET names UTF8");
header("Content-Type: text/html; charset=utf-8");
?>