Custom_Controller_Plugin_Layout.php

Custom_Controller_Plugin_Layout.php

<?php
public function postDispatch(Zend_Controller_Request_Abstract $request)
{
    $layout = Zend_Layout::getMvcInstance();

    // Return early if forward detected
    if (!$request->isDispatched()
        || $this->getResponse()->isRedirect()
        || ($layout->getMvcSuccessfulActionOnly()
            && (!empty($helper) && !$helper->isActionControllerSuccessful())))
    {
        return;
    }

    // Return early if layout has been disabled
    if (!$layout->isEnabled()) {
        return;
    }

    if ($layout->getLayout() !== 'layout2018') {
        return;
    }

    $response   = $this->getResponse();
    $fullContent = null;

    $obStartLevel = ob_get_level();
    try {
        // hack to output header first
        $layout->setLayout('layout2018head');
        $fullContent = $layout->render();

        // set it back to original value for original behaviour.
        $layout->setLayout('layout2018');
    } catch (Exception $e) {
        while (ob_get_level() > $obStartLevel) {
            $fullContent .= ob_get_clean();
        }
        $request->setParam('layoutFullContent', $fullContent);
        $request->setParam('layoutContent', $layout->content);
        $response->setBody(null);
        throw $e;
    }

    ob_end_flush();

    // output header immediately
    echo $fullContent;
    flush();
}

https://github.com/zendframework/zf1/blob/136735e776f520b081cd374012852cb88cef9a88/library/Zend/Layout/Controller/Plugin/Layout.php#L108