C:/xampp/htdocs/moodle/webservice/upload.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

define('AJAX_SCRIPT', true);
define('NO_MOODLE_COOKIES', true);
require_once(dirname(dirname(__FILE__)) . '/config.php');
require_once($CFG->dirroot . '/webservice/lib.php');
$filepath = optional_param('filepath', '/', PARAM_PATH);

echo $OUTPUT->header();

//authenticate the user
$token = required_param('token', PARAM_ALPHANUM);
$webservicelib = new webservice();
$authenticationinfo = $webservicelib->authenticate_user($token);

//check the user can manage his own files (can upload)
$context = get_context_instance(CONTEXT_USER, $USER->id);
require_capability('moodle/user:manageownfiles', $context);

$fs = get_file_storage();

$totalsize = 0;
$files = array();
foreach ($_FILES as $fieldname=>$uploaded_file) {
    // check upload errors
    if (!empty($_FILES[$fieldname]['error'])) {
        switch ($_FILES[$fieldname]['error']) {
        case UPLOAD_ERR_INI_SIZE:
            throw new moodle_exception('upload_error_ini_size', 'repository_upload');
            break;
        case UPLOAD_ERR_FORM_SIZE:
            throw new moodle_exception('upload_error_form_size', 'repository_upload');
            break;
        case UPLOAD_ERR_PARTIAL:
            throw new moodle_exception('upload_error_partial', 'repository_upload');
            break;
        case UPLOAD_ERR_NO_FILE:
            throw new moodle_exception('upload_error_no_file', 'repository_upload');
            break;
        case UPLOAD_ERR_NO_TMP_DIR:
            throw new moodle_exception('upload_error_no_tmp_dir', 'repository_upload');
            break;
        case UPLOAD_ERR_CANT_WRITE:
            throw new moodle_exception('upload_error_cant_write', 'repository_upload');
            break;
        case UPLOAD_ERR_EXTENSION:
            throw new moodle_exception('upload_error_extension', 'repository_upload');
            break;
        default:
            throw new moodle_exception('nofile');
        }
    }
    $file = new stdClass();
    $file->filename = clean_param($_FILES[$fieldname]['name'], PARAM_FILE);
    // check system maxbytes setting
    if (($_FILES[$fieldname]['size'] > get_max_upload_file_size($CFG->maxbytes))) {
        // oversize file will be ignored, error added to array to notify
        // web service client
        $file->errortype = 'fileoversized';
        $file->error = get_string('maxbytes', 'error');
    } else {
        $file->filepath = $_FILES[$fieldname]['tmp_name'];
        // calculate total size of upload
        $totalsize += $_FILES[$fieldname]['size'];
    }
    $files[] = $file;
}

$fs = get_file_storage();

$usedspace = 0;
$privatefiles = $fs->get_area_files($context->id, 'user', 'private', false, 'id', false);
foreach ($privatefiles as $file) {
    $usedspace += $file->get_filesize();
}

if ($totalsize > ($CFG->userquota - $usedspace)) {
    throw new file_exception('userquotalimit');
}

$results = array();
foreach ($files as $file) {
    if (!empty($file->error)) {
        // including error and filename
        $results[] = $file;
        continue;
    }
    $file_record = new stdClass;
    $file_record->component = 'user';
    $file_record->contextid = $context->id;
    $file_record->userid    = $USER->id;
    $file_record->filearea  = 'private';
    $file_record->filename = $file->filename;
    $file_record->filepath  = $filepath;
    $file_record->itemid    = 0;
    $file_record->license   = $CFG->sitedefaultlicense;
    $file_record->author    = fullname($authenticationinfo['user']);;
    $file_record->source    = '';

    //Check if the file already exist
    $existingfile = $fs->file_exists($file_record->contextid, $file_record->component, $file_record->filearea,
                $file_record->itemid, $file_record->filepath, $file_record->filename);
    if ($existingfile) {
        $file->errortype = 'filenameexist';
        $file->error = get_string('filenameexist', 'webservice', $file->filename);
        $results[] = $file;
    } else {
        $stored_file = $fs->create_file_from_pathname($file_record, $file->filepath);
        $results[] = $file_record;
    }
}
echo json_encode($results);