CI框架加载PHPExcel
下载phpexcel，放在application/libraries目录下
只需要把Classes下的问价拿出来，如下：
require_once '/application/libraries/PHPExcel.php';
require_once '/application/libraries/PHPExcel/IOFactory.php';
require_once '/application/libraries/PHPExcel/Reader/Excel5.php';
$file = 'application/lead.xlsx';//Excel文件，可以是上传的
$objPHPExcel = PHPExcel_IOFactory::load($file);
$arrExcel = $objPHPExcel->getSheet(0)->toArray();
var_dump($arrExcel);
