ช่วยหน่อยครับ import ข้อมูลจาก excel ไม่เข้า database

require_once 'phpexcel/PHPExcel/Classes/PHPExcel.php';
        require 'phpexcel/PHPExcel/Classes/PHPExcel/IOFactory.php';

        #$inputFileName = $path_src . $data['name'];
		$inputFileName = $_FILES['pic']['tmp_name'];
        $inputFileType = PHPExcel_IOFactory::identify($inputFileName);
        $objReader = PHPExcel_IOFactory::createReader($inputFileType);

        $objPHPExcel = $objReader->load($inputFileName);

        $objWorksheet = $objPHPExcel->setActiveSheetIndex(0);
        $highestRow = $objWorksheet->getHighestRow();
        $highestColumn = $objWorksheet->getHighestColumn();

        $headingsArray = $objWorksheet->rangeToArray('A1:' . $highestColumn . '1', null, true, true, true);
        $headingsArray = $headingsArray[1];

        $r = -1;
        $namedDataArray = array();
        for ($row = 2; $row <= $highestRow; ++$row) {
            $dataRow = $objWorksheet->rangeToArray('A' . $row . ':' . $highestColumn . $row, null, true, true, true);
            if ((isset($dataRow[$row]['A'])) && ($dataRow[$row]['A'] > '')) {
                ++$r;
                foreach ($headingsArray as $columnKey => $columnHeading) {
                    $namedDataArray[$r][$columnHeading] = $dataRow[$row][$columnKey];
                }
            }
        }

        foreach ($namedDataArray as $resx) {
            mysql_query(" INSERT INTO " . $prefix . "test (first_name,last_name) VALUES('" . $resx['first_name'] . "','" . $resx['last_name'] . "')");
        }