/**
* Generate an TSV (tab-separated value) file for the survey structure
* @param type $surveyid
*/
private function _exporttsv($surveyid)
{
$fn = "limesurvey_survey_{$surveyid}.txt";
header("Content-Type: text/tab-separated-values charset=UTF-8");
header("Content-Disposition: attachment; filename={$fn}");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
// Date in the past
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Pragma: public");
// HTTP/1.0
$data =& LimeExpressionManager::TSVSurveyExport($surveyid);
$lines = array();
foreach ($data as $row) {
$lines[] = implode("\t", str_replace(array("\t", "\n", "\r"), array(" ", " ", " "), $row));
}
$output = implode("\n", $lines);
// echo "\xEF\xBB\xBF"; // UTF-8 BOM
echo $output;
return;
}