How to programmatically check whether Magento 2 runs in the developer mode

dmitry_fedyuk · December 9, 2015, 3:11am

An example from the core:

magento/magento2/blob/2.0.0/app/code/Magento/Email/Model/Template/Filter.php#L936




        $emogrifier = $this->emogrifier;
        $emogrifier->setHtml($html);
        $emogrifier->setCss($cssToInline);


        // Don't parse inline <style> tags, since existing tag is intentionally for non-inline styles
        $emogrifier->disableStyleBlocksParsing();


        $processedHtml = $emogrifier->emogrify();
    } catch (\Exception $e) {
        if ($this->_appState->getMode() == \Magento\Framework\App\State::MODE_DEVELOPER) {
            $processedHtml = __('CSS inlining error:') . PHP_EOL . $e->getMessage()
                . PHP_EOL
                . $html;
        } else {
            $processedHtml = $html;
        }
        $this->_logger->error($e);
    }
} else {
    $processedHtml = $html;

A sample detection code:

/** @var \Magento\Framework\App\ObjectManager $om */
$om = \Magento\Framework\App\ObjectManager::getInstance();
/** @return \Magento\Framework\App\State */
$state = $om->get('Magento\Framework\App\State');
/** @var bool $isDeveloperMode */
$isDeveloperMode = \Magento\Framework\App\State::MODE_DEVELOPER === $state->getMode();

dmitry_fedyuk · December 9, 2015, 3:11am