PKPTemplateManager::display PHP Method

    function display($template, $sendContentType = null, $hookName = null, $display = true)
    {
        // Set the defaults
        // N.B: This was moved from method signature to allow calls such as: ->display($template, null, null, false)
        if (is_null($sendContentType)) {
            $sendContentType = 'text/html';
        }
        if (is_null($hookName)) {
            $hookName = 'TemplateManager::display';
        }
        $charset = Config::getVar('i18n', 'client_charset');
        // Give any hooks registered against the TemplateManager
        // the opportunity to modify behavior; otherwise, display
        // the template as usual.
        $output = null;
        if (!HookRegistry::call($hookName, array($this, &$template, &$sendContentType, &$charset, &$output))) {
            // If this is the main display call, send headers.
            if ($hookName == 'TemplateManager::display') {
                // Explicitly set the character encoding
                // Required in case server is using Apache's
                // AddDefaultCharset directive (which can
                // prevent browser auto-detection of the proper
                // character set)
                header('Content-Type: ' . $sendContentType . '; charset=' . $charset);
                // Send caching info
                header('Cache-Control: ' . $this->_cacheability);
            }
            // Actually display the template.
            return $this->fetch($template, null, null, $display);
        } else {
            // Display the results of the plugin.
            echo $output;
        }
    }