Platformsh\Cli\Local\LocalApplication::getApplication PHP Method

    public static function getApplication($name, $directory, CliConfig $config = null)
    {
        $apps = self::getApplications($directory, $config);
        if ($name === null && count($apps) === 1) {
            return reset($apps);
        }
        foreach ($apps as $app) {
            if ($app->getName() === $name) {
                return $app;
            }
        }
        throw new \InvalidArgumentException('App not found: ' . $name);
    }

 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $this->validateInput($input);
     $drushCommand = $input->getArgument('cmd');
     $sshOptions = '';
     // Pass through options that the CLI shares with Drush and SSH.
     foreach (['yes', 'no', 'quiet'] as $option) {
         if ($input->getOption($option)) {
             $drushCommand .= " --{$option}";
         }
     }
     if ($output->getVerbosity() >= OutputInterface::VERBOSITY_DEBUG) {
         $drushCommand .= " --debug";
         $sshOptions .= ' -vv';
     } elseif ($output->getVerbosity() >= OutputInterface::VERBOSITY_VERY_VERBOSE) {
         $drushCommand .= " --verbose";
         $sshOptions .= ' -v';
     } elseif ($output->getVerbosity() >= OutputInterface::VERBOSITY_VERBOSE) {
         $drushCommand .= " --verbose";
     } elseif ($output->getVerbosity() == OutputInterface::VERBOSITY_QUIET) {
         $drushCommand .= " --quiet";
         $sshOptions .= ' -q';
     }
     $appName = $this->selectApp($input, function (LocalApplication $app) {
         return Drupal::isDrupal($app->getRoot());
     });
     $selectedEnvironment = $this->getSelectedEnvironment();
     $sshUrl = $selectedEnvironment->getSshUrl($appName);
     // Get the LocalApplication object for the specified application, if
     // available.
     $projectRoot = $this->getProjectRoot();
     if ($projectRoot && $this->selectedProjectIsCurrent()) {
         $app = LocalApplication::getApplication($appName, $projectRoot, self::$config);
     }
     // Use the local application configuration (if available) to determine
     // the correct Drupal root.
     if (isset($app)) {
         $drupalRoot = '/app/' . $app->getDocumentRoot();
     } else {
         // Fall back to the PLATFORM_DOCUMENT_ROOT environment variable,
         // which is usually correct, except where the document_root was
         // specified as '/'.
         $documentRootEnvVar = self::$config->get('service.env_prefix') . 'DOCUMENT_ROOT';
         $drupalRoot = '${' . $documentRootEnvVar . ':-/app/public}';
         $this->debug('<comment>Warning:</comment> using $' . $documentRootEnvVar . ' for the Drupal root. This fails in cases where the document_root is /.');
     }
     $dimensions = $this->getApplication()->getTerminalDimensions();
     $columns = $dimensions[0] ?: 80;
     $sshDrushCommand = "COLUMNS={$columns} drush --root=\"{$drupalRoot}\"";
     if ($environmentUrl = $selectedEnvironment->getLink('public-url')) {
         $sshDrushCommand .= " --uri=" . escapeshellarg($environmentUrl);
     }
     $sshDrushCommand .= ' ' . $drushCommand . ' 2>&1';
     $command = 'ssh' . $sshOptions . ' ' . escapeshellarg($sshUrl) . ' ' . escapeshellarg($sshDrushCommand);
     return $this->getHelper('shell')->executeSimple($command);
 }