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php 消息实时推送，反ajax推送

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入口文件index.html 
<!DOCTYPE HTML>
<html>
<head>
    <title>反ajax推送</title>
    <style>
        .send{color:#555;text-align: left;}
        .require{color:blue;text-align: right;}
        .content_box{text-align: center;margin: 20px;
                    border: 1px solid #ddd;padding: 20px;}
    </style>
    <script src="http://code.jQuery.com/jquery-1.11.2.min.js"></script>
</head>
<body>
    <div class="content_box" >消息框</div>
    <div class="content_box" >
    </div>
    <div >
        <select >
            <option value="1" selected="selected">1</option>
            <option value="2">2</option>
        </select>
        <input type="text"  value="" >
        <button >发送</button>
        <button >连接</button>
    </div>
    <div class="error_tip" >
    </div>
    <script>
        $(function(){
            //发送消息
            $('#btn_send').click(function(){
                var send_text = $('#send_text').val();
                if(send_text.length <= 0){
                    $('#error_tip').html('不能输入空值');
                }else{
                    send(send_text);
                }
            });
            //按回车键发送消息
            $('#send_text').on('keyup',function(e){
                if(e.keyCode == 13){
                    $('#btn_send').trigger('click');
                }
            });
            //建立通讯链接
            $('#btn_link').click(function(){
                connect();
                var _this = $(this);
                _this.attr('disabled',true);
                _this.html('已连接');
            });


        });
        //建立通讯连接函数
        function connect(){
            $('#content_box_title').html($('#username').val()+'的消息窗口');
            $.ajax({
                data:{'user':$('#username').val()},
                url:'ajaxPush.PHP',
                type:'get',
                timeout:0,
                dataType:'json',
                success:function(data){
                    $('#content_box').append('<div class="require">'+data.msg+'</div>');
                    connect();
                }
            });
        }
        //发送消息函数
        function send(massege){
            var user =$('#username').val();
            $.getJSON('write.php',{'msg':massege,'user':user},function(data){
                if(data.sf){
                    $('#content_box').append('<div class="send">'+massege+'</div>');
                    $('#send_text').val('');
                }else{
                    $('#error_tip').html('输入保存错误！');
                }
            });
        }
    </script>
</body>
</html>

ajax处理输入 write.php

<?php
/**
 * Created by TXM.
 * Time: 2015/4/18 13:13
 * function:
 */


$filename  = dirname(__FILE__).'/data.txt';
$isread_file = dirname(__FILE__).'/isread.txt';
$user = dirname(__FILE__).'/user.txt';


//写入消息，消息未读，谁发送的消息
file_put_contents($filename,$_GET['msg']);
file_put_contents($isread_file,'0');
file_put_contents($user,$_GET['user']);


echo json_encode(array('sf'=>true));

长轮询推送 ajaxPush.php

<?php
/**
 * Created by TXM.
 * Time: 2015/4/18 13:12
 * function:
 */
$filename  = dirname(__FILE__).'/data.txt';
$isread_file = dirname(__FILE__).'/isread.txt';
$userfile = dirname(__FILE__).'/user.txt';
$get_user = $_GET['user'] == '1'?'2':'1';
$msg='';


while(1){
    $msg = file_get_contents($filename);
    $isread = file_get_contents($isread_file);
    $user = file_get_contents($userfile);


    //是对方发送的消息，设置消息已读，退出循环。
    if($isread == '0' && $get_user == $user){
        file_put_contents($isread_file,'1');
        break;
    }
    sleep(1);
}


echo json_encode(array('msg'=>$msg));

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