phpエクスポートデータexcel

function down_grade()
	{
		//      
		$tb_tester = new IModel("tester");
		$tb_paper = new IModel('paper');
		$tb_exam = new IModel("exam");
		$tb_group = new IModel('group');
		
		$exam_info = $tb_exam->query("Eischeck <> 0");
		
		$name = date('Ymd')."    .xls";
		header("Content-type:application/vnd.ms-excel");
		header("Content-Disposition:attachment;filename=".$name);
		$tx="  \t    \t    \t    \t  \t    
";
		echo $tx;
		foreach($exam_info as $exam)
		{
			$tester = $tb_tester->getObj('ID='.$exam['Etesterid']);
			$paper = $tb_paper->getObj('ID='.$exam['Epaperid']);
			$group = $tb_group->getObj('ID='.$tester['Tgroupid']); 
			echo $tester['Tname']."\t".$group['Ggroupname']."\t";
			echo $paper['Ppapername']."\t";
			echo $exam['Esubmittime']."\t".$exam['Egrades']."\t";
			echo $tester['Tmobile']."
";
		}
	}