extension_loaded

Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Find out whether an extension is loaded
extension_loaded(string $extension): bool
                $this->output->write($line);

            });

        } catch (
ProcessSignaledException $e) {

            if (
extension_loaded('pcntl') && $e->getSignal() !== SIGINT) {

                throw 
$e;

            }

        }
    public function isInstalled(): bool

    
{

        return 
extension_loaded('swoole');

    }