C:/xampp/htdocs/moodle/lib/form/filepicker.php

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<?php

global $CFG;

require_once("HTML/QuickForm/button.php");
require_once($CFG->dirroot.'/repository/lib.php');

class MoodleQuickForm_filepicker extends HTML_QuickForm_input {
    public $_helpbutton = '';
    protected $_options    = array('maxbytes'=>0, 'accepted_types'=>'*', 'return_types'=>FILE_INTERNAL);

    function MoodleQuickForm_filepicker($elementName=null, $elementLabel=null, $attributes=null, $options=null) {
        global $CFG;

        $options = (array)$options;
        foreach ($options as $name=>$value) {
            if (array_key_exists($name, $this->_options)) {
                $this->_options[$name] = $value;
            }
        }
        if (!empty($options['maxbytes'])) {
            $this->_options['maxbytes'] = get_max_upload_file_size($CFG->maxbytes, $options['maxbytes']);
        }
        $this->_type = 'filepicker';
        parent::HTML_QuickForm_input($elementName, $elementLabel, $attributes);
    }

    function setHelpButton($helpbuttonargs, $function='helpbutton') {
        debugging('component setHelpButton() is not used any more, please use $mform->setHelpButton() instead');
    }

    function getHelpButton() {
        return $this->_helpbutton;
    }

    function getElementTemplateType() {
        if ($this->_flagFrozen){
            return 'nodisplay';
        } else {
            return 'default';
        }
    }

    function toHtml() {
        global $CFG, $COURSE, $USER, $PAGE, $OUTPUT;
        $id     = $this->_attributes['id'];
        $elname = $this->_attributes['name'];

        if ($this->_flagFrozen) {
            return $this->getFrozenHtml();
        }
        if (!$draftitemid = (int)$this->getValue()) {
            // no existing area info provided - let's use fresh new draft area
            $draftitemid = file_get_unused_draft_itemid();
            $this->setValue($draftitemid);
        }

        if ($COURSE->id == SITEID) {
            $context = get_context_instance(CONTEXT_SYSTEM);
        } else {
            $context = get_context_instance(CONTEXT_COURSE, $COURSE->id);
        }

        $client_id = uniqid();

        $args = new stdClass();
        // need these three to filter repositories list
        $args->accepted_types = $this->_options['accepted_types']?$this->_options['accepted_types']:'*';
        $args->return_types = FILE_INTERNAL;
        $args->itemid = $draftitemid;
        $args->maxbytes = $this->_options['maxbytes'];
        $args->context = $PAGE->context;
        $args->buttonname = $elname.'choose';
        $args->elementname = $elname;

        $html = $this->_getTabs();
        $fp = new file_picker($args);
        $options = $fp->options;
        $options->context = $PAGE->context;
        $html .= $OUTPUT->render($fp);
        $html .= '<input type="hidden" name="'.$elname.'" id="'.$id.'" value="'.$draftitemid.'" class="filepickerhidden"/>';

        $module = array('name'=>'form_filepicker', 'fullpath'=>'/lib/form/filepicker.js', 'requires'=>array('core_filepicker', 'node', 'node-event-simulate'));
        $PAGE->requires->js_init_call('M.form_filepicker.init', array($fp->options), true, $module);

        $nonjsfilepicker = new moodle_url('/repository/draftfiles_manager.php', array(
            'env'=>'filepicker',
            'action'=>'browse',
            'itemid'=>$draftitemid,
            'subdirs'=>0,
            'maxbytes'=>$options->maxbytes,
            'maxfiles'=>1,
            'ctx_id'=>$PAGE->context->id,
            'course'=>$PAGE->course->id,
            'sesskey'=>sesskey(),
            ));

        // non js file picker
        $html .= '<noscript>';
        $html .= "<div><object type='text/html' data='$nonjsfilepicker' height='160' width='600' style='border:1px solid #000'></object></div>";
        $html .= '</noscript>';

        return $html;
    }

    function exportValue(&$submitValues, $assoc = false) {
        global $USER;

        $draftitemid = $this->_findValue($submitValues);
        if (null === $draftitemid) {
            $draftitemid = $this->getValue();
        }

        // make sure max one file is present and it is not too big
        if (!is_null($draftitemid)) {
            $fs = get_file_storage();
            $usercontext = get_context_instance(CONTEXT_USER, $USER->id);
            if ($files = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id DESC', false)) {
                $file = array_shift($files);
                if ($this->_options['maxbytes'] and $file->get_filesize() > $this->_options['maxbytes']) {
                    // bad luck, somebody tries to sneak in oversized file
                    $file->delete();
                }
                foreach ($files as $file) {
                    // only one file expected
                    $file->delete();
                }
            }
        }

        return $this->_prepareValue($draftitemid, true);
    }
}