ajax编码问题，在线等大侠帮忙！！！

	public function ajax_page(){

		//header('Content-Type:text/html;charset=gbk');

		error_reporting(E_ALL);

		$page = $this->input->post('pg');

		$where = $this->input->post('action');

		$array = explode('_',$where);

		$condition['group_id'] = $array[0];

		$condition['status'] = $array[1];

		$condition['username'] = @iconv( "UTF-8","GBK", $array[2]);

echo $condition['username'];

		$condition['display'] = 15;

		$condition['page'] = ($page-1) * 15;

		$num = $this->member_model->Selcount($condition);

        $url = base_url()."/index.php/admin/member_list/";

		$this->page->select = $where;

        $this->page_model->page($num,"15",$page,$url);

        $data['page'] = $this->page->pagenav;

		$data['user'] = $this->member_model->Selmember($condition);

        $this->load->language('admin/member');

        $data['lang'] = $this->lang->line('HtmlLanguages');

  	 	//print_r($data['user']);//exit;



   		$this->load->view('admin/member_list_ajax', $data);



	}

<script type="text/javascript"> 

$(function(){

    $('#begin_date').datepicker({dateFormat: 'yy-mm-dd'});

    $('#end_date').datepicker({dateFormat: 'yy-mm-dd'});

});

function checkdata(){

	if((!$('#begin_date').val()&&$('#end_date').val())||($('#begin_date').val()&&!$('#end_date').val())){

		alert('<?=$lang['date_error']?>');

		return false;

	}

}

function php300(page,where){

	var ajax_url = "/admin/ajax_page/";

    where = encodeURIComponent(where);

	$.ajax({

		type: "POST",

		url: ajax_url,

		data:{ 

			action: where,

			pg: page

		},

		success: function(msg){

			//alert(msg);

			$("#ajax").html(msg);

		},//$("#pager").html(msg);

		error:function(){ 

			$("#ajax").html("请求失败"); 

		}

    });

   

}

</script>

------解决方案--------------------
接收的参数用urldecode解码试试
------解决方案--------------------
你的客户端用的是 jquery 吧？
jq 的 ajax 是不需要自己做 url 编码的
既然你已经有 where = encodeURIComponent(where); 了
那么就需要自己再做一次 url 解码
$condition['username'] = iconv( "UTF-8","GBK", uredecode($array[2]));