PMA\libraries\controllers\server\ServerVariablesController::indexAction PHP Method

    public function indexAction()
    {
        if (!empty($_REQUEST['ajax_request']) && isset($_REQUEST['type']) && $_REQUEST['type'] === 'getval') {
            $this->getValueAction();
            return;
        }
        if (!empty($_REQUEST['ajax_request']) && isset($_REQUEST['type']) && $_REQUEST['type'] === 'setval') {
            $this->setValueAction();
            return;
        }
        include 'libraries/server_common.inc.php';
        $header = $this->response->getHeader();
        $scripts = $header->getScripts();
        $scripts->addFile('server_variables.js');
        /**
         * Displays the sub-page heading
         */
        $doc_link = Util::showMySQLDocu('server_system_variables');
        $this->response->addHtml(PMA_getHtmlForSubPageHeader('variables', $doc_link));
        /**
         * Sends the queries and buffers the results
         */
        $serverVarsResult = $this->dbi->tryQuery('SHOW SESSION VARIABLES;');
        if ($serverVarsResult !== false) {
            $serverVarsSession = array();
            while ($arr = $this->dbi->fetchRow($serverVarsResult)) {
                $serverVarsSession[$arr[0]] = $arr[1];
            }
            $this->dbi->freeResult($serverVarsResult);
            $serverVars = $this->dbi->fetchResult('SHOW GLOBAL VARIABLES;', 0, 1);
            /**
             * Link templates
             */
            $this->response->addHtml($this->_getHtmlForLinkTemplates());
            /**
             * Displays the page
             */
            $this->response->addHtml($this->_getHtmlForServerVariables($serverVars, $serverVarsSession));
        } else {
            /**
             * Display the error message
             */
            $this->response->addHTML(Message::error(sprintf(__('Not enough privilege to view server variables and ' . 'settings. %s'), Util::showMySQLDocu('server-system-variables', false, 'sysvar_show_compatibility_56')))->getDisplay());
        }
    }