Check the current Moodle version function by given params

check_moodle_version.php

/**
 * Function to check the current Moodle version pass your params
 *
 * @param string $version Number of version or release['3.5' or '4.1'] (depends on @param $checkfor)
 * @param string $checkfor ['all' or 'release' ($version like '3.1.3')] or 'version' ($version like '2016052303')
 * @param string $compare http://php.net/manual/function.version-compare.php#refsect1-function.version-compare-parameters
 * @return bool
 * @author Igor Sazonov <sovletig@gmail.com>
 * @example $check = checkMoodleVersion('3.9'); //if current Moodle version is 4.2 - returns true because $compare is >=
 */
function checkMoodleVersion($version, $compare = '>=', $checkfor = 'all') {
    global $CFG;
    $versions = [
        '3.1' => [
            'version' => '2016052300',
            'release' => '3.1',
        ],
        '3.2' => [
            'version' => '2016120500',
            'release' => '3.2',
        ],
        '3.3' => [
            'version' => '2017051500',
            'release' => '3.3',
        ],
        '3.4' => [
            'version' => '2017111300',
            'release' => '3.4',
        ],
        '3.5' => [
            'version' => '2018051700',
            'release' => '3.5',
        ],
        '3.6' => [
            'version' => '2018120300',
            'release' => '3.6',
        ],
        '3.7' => [
            'version' => '2019052000',
            'release' => '3.7',
        ],
        '3.8' => [
            'version' => '2019111800',
            'release' => '3.8',
        ],
        '3.9' => [
            'version' => '2020061500',
            'release' => '3.9',
        ],
        '4.0' => [
            'version' => '2022041900',
            'release' => '4.0',
        ],
        '4.1' => [
            'version' => '2022112800',
            'release' => '4.1',
        ],
        '4.2' => [
            'version' => '2023042400',
            'release' => '4.2',
        ],
        '4.3' => [
            'version' => '2023100900',
            'release' => '4.3',
        ],
    ];
    $release = (strpos($CFG->release, ' ') === false) ? $CFG->release : explode(' ', $CFG->release)[0];
    switch ($checkfor) {
        case 'all':
            if (isset($versions[$version]['version'])) {
                return version_compare($CFG->version, $versions[$version]['version'], $compare) &&
                    version_compare($release, $version, $compare);
            }
            break;
        case 'version':
        case 'release':
            if (isset($versions[$version][$checkfor])) {
                if ($checkfor == 'release') {
                    return version_compare($release, $versions[$version][$checkfor], $compare);
                }
                return version_compare($CFG->$checkfor, $versions[$version][$checkfor], $compare);
            }
            break;
    }
    return false;
}