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5fbbb51882
The json_decode function does not accept a null, which is the traditional default for get_user_preferences. By passing a default of am empty string we avoid issues in PHP 8.1.
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Moodle - the world's open source learning platform
Moodle <https://moodle.org> is a learning platform designed to provide
educators, administrators and learners with a single robust, secure and
integrated system to create personalised learning environments.
You can download Moodle <https://download.moodle.org> and run it on your own
web server, ask one of our Moodle Partners <https://moodle.com/partners/> to
assist you, or have a MoodleCloud site <https://moodle.com/cloud/> set up for
you.
Moodle is widely used around the world by universities, schools, companies and
all manner of organisations and individuals.
Moodle is provided freely as open source software, under the GNU General Public
License <https://docs.moodle.org/dev/License>.
Moodle is written in PHP and JavaScript and uses an SQL database for storing
the data.
See <https://docs.moodle.org> for details of Moodle's many features.