C:/xampp/htdocs/moodle/mod/data/css.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('NO_MOODLE_COOKIES', true); // session not used here

require_once('../../config.php');

$d = optional_param('d', 0, PARAM_INT);   // database id
$lifetime  = 600;                                   // Seconds to cache this stylesheet

$PAGE->set_url('/mod/data/css.php', array('d'=>$d));

if ($data = $DB->get_record('data', array('id'=>$d))) {
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
    header('Expires: ' . gmdate("D, d M Y H:i:s", time() + $lifetime) . ' GMT');
    header('Cache-control: max_age = '. $lifetime);
    header('Pragma: ');
    header('Content-type: text/css; charset=utf-8');  // Correct MIME type

    echo $data->csstemplate;
}