PMA\libraries\DatabaseInterface::postConnect PHP Method

    public function postConnect($link)
    {
        if (!defined('PMA_MYSQL_INT_VERSION')) {
            $version = $this->fetchSingleRow('SELECT @@version, @@version_comment', 'ASSOC', $link);
            if ($version) {
                $match = explode('.', $version['@@version']);
                define('PMA_MYSQL_MAJOR_VERSION', (int) $match[0]);
                define('PMA_MYSQL_INT_VERSION', (int) sprintf('%d%02d%02d', $match[0], $match[1], intval($match[2])));
                define('PMA_MYSQL_STR_VERSION', $version['@@version']);
                define('PMA_MYSQL_VERSION_COMMENT', $version['@@version_comment']);
            } else {
                define('PMA_MYSQL_INT_VERSION', 50501);
                define('PMA_MYSQL_MAJOR_VERSION', 5);
                define('PMA_MYSQL_STR_VERSION', '5.05.01');
                define('PMA_MYSQL_VERSION_COMMENT', '');
            }
            /* Detect MariaDB */
            if (mb_strpos(PMA_MYSQL_STR_VERSION, 'MariaDB') !== false) {
                define('PMA_MARIADB', true);
            } else {
                define('PMA_MARIADB', false);
            }
        }
        if (PMA_MYSQL_INT_VERSION > 50503) {
            $default_charset = 'utf8mb4';
            $default_collation = 'utf8mb4_general_ci';
        } else {
            $default_charset = 'utf8';
            $default_collation = 'utf8_general_ci';
        }
        if (!empty($GLOBALS['collation_connection'])) {
            $this->query("SET CHARACTER SET '{$default_charset}';", $link, self::QUERY_STORE);
            /* Automatically adjust collation to mb4 variant */
            if ($default_charset == 'utf8mb4' && strncmp('utf8_', $GLOBALS['collation_connection'], 5) == 0) {
                $GLOBALS['collation_connection'] = 'utf8mb4_' . substr($GLOBALS['collation_connection'], 5);
            }
            $result = $this->tryQuery("SET collation_connection = '" . $this->escapeString($GLOBALS['collation_connection'], $link) . "';", $link, self::QUERY_STORE);
            if ($result === false) {
                trigger_error(__('Failed to set configured collation connection!'), E_USER_WARNING);
                $this->query("SET collation_connection = '" . $this->escapeString($GLOBALS['collation_connection'], $link) . "';", $link, self::QUERY_STORE);
            }
        } else {
            $this->query("SET NAMES '{$default_charset}' COLLATE '{$default_collation}';", $link, self::QUERY_STORE);
        }
        /* Locale for messages */
        $locale = LanguageManager::getInstance()->getCurrentLanguage()->getMySQLLocale();
        if (!empty($locale)) {
            $this->query("SET lc_messages = '" . $locale . "';", $link, self::QUERY_STORE);
        }
    }