EnvironmentStatus.php

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<?php
namespace TYPO3\CMS\Install\Controller\Action\Ajax;

class EnvironmentStatus extends AbstractAjaxAction {

    protected function executeAction() {
        $statusUtility = $this->objectManager->get('TYPO3\\CMS\\Install\\Status\\StatusUtility');

        // Count of failed environment checks are displayed in the left navigation menu
        $environmentStatus = $this->objectManager->get('TYPO3\\CMS\\Install\\SystemEnvironment\\Check')->getStatus();
        $environmentErrors = $statusUtility->filterBySeverity($environmentStatus, 'error');
        return count($environmentErrors);
    }
}