请求php返回json生成自定义对象

public function convert_array(){
$arr  = array(
'0'=>array('name'=>'zc','height'=>173),
'1'=>array('name'=>'tom','height'=>175),
'2'=>array('name'=>'jm','height'=>173),
'3'=>array('name'=>'tang','height'=>173),
);
echo json_encode($arr); //必须echo
}

<input type="button" value='转换' id='convert' />
<div id="test"></div>

$("#convert").bind('click',function(){
$.getJSON("http://www.ci.com/select/convert_array", function(json){
var json = eval(json);
//生成select对象
var select_object = $('<select>',{'id':'myselect','name':'myselect'});
for(var i=0;i<json.length;i++){
var option_object = $('<option>',{'value':json[i].height,'text':json[i].name});
select_object.append(option_object);
}
//将select 添加到div中
$('#test').append(select_object);
});
});