请教怎么php怎么返回变量+组装html给ajax

return "$result,$a,$b";<br>

success:function(json){<br>
            a = json.split(',');

function html($select,$name){<br>
global $pagecon;<br>
$a='1';<br>
$b='2';<br>
$result='';<br>
$result.='<ul id="thumbs">';<br>
while($row=$select->fetch()){<br>
$result.='<li class="'.$name.'isotope-item">';<br>
$result.='<img src="ztImg/'.$row['riseimg'].'"width=235 height=300 alt=""//></div><ul>';<br>
$result.='<h3 class="title">'.$row['ztname'].'</h3>';<br>
$result.='<span class="category">'. $row['zttype'].'</span>';    <br>
$result.='<p class="intro">推荐日期:'.$row['zttime'].'</p></div></li>';<br>
    }<br>
$result.='</ul>';<br>
$result.='<center><h4>'.$pagecon.'</h4></center>';<br>
return $result.'--'.$a.'--'.$b;//用--来连接返回<br>
}

function getData(page){<br>
        alert('ok');<br>
     $.ajax({<br>
     type:'post',<br>
     url:'action/test.php',<br>
    data: {'pageNum':page-1},<br>
        beforeSend:function(){<br>
            $("#sss ul").append("<li id='loading'>loading...</li>");<br>
        },<br>
        success:function(json){<br>
            var arr=json.split('--');<br>
            $("#sss ul").empty();<br>
            result = arr['0']//获得来自php的变量$result<br>
            total = arr['0']//获得来自php的变量$a<br>
            pageSize = //获得来自php的变量$b<br>
             $("div#sss").html(data);<br>
        },<br>
        complete:function(){ //生成分页条<br>
            getPageBar();<br>
        },<br>
        error:function(){<br>
            alert("数据加载失败");<br>
        }<br>
    });<br>
}