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I am building custom plugin, where the admin can manually add user (choosing from the existing user and filling fields with information about him) or import .cvs file with users and their data inside. In both cases every user's entry has the following data firstname lastname datefrom dateuntil address status (booked,notattended,attended)

I use the following function in my import_form.php

class mod_myplugin_import_form extends moodleform {

/**
 * Called to define this moodle form
 *
 * @return void
 */
public function definition() {

    global $USER;
    $mform    =& $this->_form;

    $course        = $this->_customdata['course'];
    $cm            = $this->_customdata['cm'];
    $modcontext    = $this->_customdata['modcontext'];

    $mform->addElement('header', 'general', get_string('importattendees', 'myplugin'));


    $mform->addElement('filepicker', 'userfile', get_string('file'));
    $mform->addRule('userfile', null, 'required');

    $choices = csv_import_reader::get_delimiter_list();
    $mform->addElement('select', 'delimiter_name', get_string('csvdelimiter', 'tool_uploaduser'), $choices);
    if (array_key_exists('cfg', $choices)) {
        $mform->setDefault('delimiter_name', 'cfg');
    } else if (get_string('listsep', 'langconfig') == ';') {
        $mform->setDefault('delimiter_name', 'semicolon');
    } else {
        $mform->setDefault('delimiter_name', 'comma');
    }

    $choices = core_text::get_encodings();
    $mform->addElement('select', 'encoding', get_string('encoding', 'tool_uploaduser'), $choices);
    $mform->setDefault('encoding', 'UTF-8');

    $choices = array('10'=>10, '20'=>20, '100'=>100, '1000'=>1000, '100000'=>100000);
    $mform->addElement('select', 'previewrows', get_string('rowpreviewnum', 'tool_uploaduser'), $choices);
    $mform->setType('previewrows', PARAM_INT);

    $this->add_action_buttons(false, get_string('uploadusers', 'tool_uploaduser'));

    $mform->addElement('hidden', 'id', $cm->id);
}

I didn't found anything similar in plugin for Moodle and as a newbie I am not sure how to proceed.

Thank youin advance. 

S.