PHP实现每日签到功能

首次签到获得1个积分,第二次签到获得2个积分,第三次签到获得3个积分,以此类推但是签到必须每天连续积分才可以递增,如果有中断再次签到时获得积分仍然从1开始递增;
user: id,username,count,point,sign_time

sign.html

  <!DOCTYPE html>  <html lang="en">  <head>    <meta charset="UTF-8">    <title>sign</title>  </head>  <body>  <center>  <input type="text" name="username">  <button>签到</button><span id='span'></span>  <div>    <table id="box" border="1"></table>  </div>  </center>  </body>  </html>  <script src="jquery.1.12.min.js"></script>  <script>    $(function(){      $('button').click(function(){        var username=$(':text').val();        $.ajax({          type:'post',          url:'admin.php',          data:{username:username},          dataType:'json',          success:function(res){            if(res.success==1){              $('#span').html('签到成功');              var str='<tr><td>用户名</td><td>连续签到天数</td><td>总积分</td></tr>';              str+='<tr><td>'+res.msg.username+'</td><td>'+res.msg.count+'</td><td>'+res.msg.point+'</td></tr>';              $('#box').html(str);            }          }        })      });    })  </script>

admin.php

  <?php     header('content-type:text/html;charset=utf-8');    $pdo=new PDO('mysql:host=localhost;dbname=databasename;','root','root');    $pdo->exec('set names utf8');    $username=$_POST['username'];    $sqlQuery="select * from user where username='$username'";    $row=$pdo->query($sqlQuery)->fetch(PDO::FETCH_ASSOC);    if($row){      $sign_time=$row['sign_time'];      $sign_time=strtotime($sign_time);      $int=date('Y-m-d');      $int=strtotime($int);//5      $ints=$int+86400;  //6      $int_s=$int-86400;  //4      //当天已签到      if($int<$sign_time&&$sign_time<$ints){        // echo '您已签到';      }      //昨天未签到,积分,天数在签到修改为1      if($sign_time<$int_s){        $count=1;        $point=1;        $sign_time=date('Y-m-d H:s:i');        $sqlRow="update user set count='$count',point='$point',sign_time='$sign_time' where username='$username'";        $res=$pdo->exec($sqlRow);        // echo '签到成功修改为1';      }      //请签到      if($int_s<$sign_time&&$sign_time<$int){        $count=$row['count']+1;        $point=$row['point']+1;        $sign_time=date('Y-m-d H:s:i');        $sqlupdate="update user set count='$count',point='$point',sign_time='$sign_time' where username='$username'";        $res=$pdo->exec($sqlupdate);        // echo '签到成功+1';      }    }else{      $count=1;      $point=1;      $sign_time=date('Y-m-d H:s:i');      $sqlAdd="insert into user values (null,'$username','$count','$point','$sign_time')";      $res=$pdo->exec($sqlAdd);      // echo '恭喜你签到成功----1';    }    //////////////////////响应    $sqlEnd="select * from user where username='$username'";    $info=$pdo->query($sqlEnd)->fetch(PDO::FETCH_ASSOC);    echo json_encode(array('success'=>1,'msg'=>$info));die;  ?>
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