layui分页php版

$page=$_GET['page'];
$limit=$_GET['limit'];
$sql="SELECT * from test limit ".($page-1)*$limit.",".$page*$limit;
$q_sql=mysql_query($sql);
$sql2="SELECT * from test";
$q_sql2=mysql_query($sql2);
$count=mysql_num_rows($q_sql2);
$arr=array();
while($res=mysql_fetch_assoc($q_sql)){
    $arr[]=$res;
}
$data=array(
        'code'=>0,
        'msg'=>'',
        'count'=>$count,
        'data'=>$arr
    );
echo json_encode($data);