}
// Set up the import form.
$mform = new grade_import_form(null, array('includeseparator' => true, 'verbosescales' => true));
// If the csv file hasn't been imported yet then look for a form submission or
// show the initial submission form.
if (!$iid) {
// If the import form has been submitted.
if ($formdata = $mform->get_data()) {
// Large files are likely to take their time and memory. Let PHP know
// that we'll take longer, and that the process should be recycled soon
// to free up memory.
core_php_time_limit::raise();
raise_memory_limit(MEMORY_EXTRA);
// Use current (non-conflicting) time stamp.
$importcode = get_new_importcode();
$text = $mform->get_file_content('userfile');
$iid = csv_import_reader::get_new_iid('grade');
$csvimport = new csv_import_reader($iid, 'grade');
$csvimport->load_csv_content($text, $formdata->encoding, $separator);
// --- get header (field names) ---
$header = $csvimport->get_columns();
// Print a preview of the data.
$numlines = 0;
// 0 lines previewed so far.
echo $OUTPUT->heading(get_string('importpreview', 'grades'));
foreach ($header as $i => $h) {
$h = trim($h);
// Remove whitespace.
$h = clean_param($h, PARAM_RAW);
// Clean the header.
$header[$i] = $h;
