CSV出力

 ob_implicit_flush(true);
 header('Content-Disposition: attachment; filename=user.csv.csv');
 header('Content-Type: Application/Octet-Stream');
 header('Pragma: private');
 header('Cache-control: private, must-revalidate');
 foreach ($rows as $row) {
     $tmp = array();
     foreach (array('name','age','tel','tel') as $k) {
         $tmp[] = '"' . preg_replace('/"/','""',$row[$k]) . '"';
     }
     print mb_convert_encoding(join(',',$tmp),'SJIS',mb_internal_encoding()) . "\r\n";
 }

IE7だとHTTPヘッダーでキャッシュコントロールの指定が必要。