php读入excel时出现乱码，怎么处理？

php读入excel时出现乱码，怎么处理？
$this->load->library('Spreadsheet_Excel_Reader');  

$data = new Spreadsheet_Excel_Reader();
  $addr = './upload/import/train_plan.xls';
$data->read($addr);
$data->setOutputEncoding('utf-8'); //解决中文乱码
print_r($data->sheets[0]['cells']);
for( $i = 2; $i <= $data->sheets[0]['numRows']; $i++ ){
$type = @$data->sheets[0]['cells'][$i][1];//工号
 
}

Array ( [1] => Array ( [1] =>  z{|+R [2] =>  z T饄 [3] =>  z?u鵞a? [4] => 矉^ [5] =>  zb__ [6] => 篘pe [7] => 10g [8] => 11g [9] => 12g ) [2] => Array ( [1] => NN€b齹 [2] => LINU [3] => 鹼邁_裇篘XT [4] => Ng\ h [5] => 匭瓔 [6] => 40 [7] => g+g [8] => 1 [9] => 2 ) )

http://tieba.baidu.com/p/1136190421