Supported Versions: PHP 5 >= 5.4.0, PHP 7, PHP 8
Checks if the trait exists
trait_exists(string $traitbool $autoload true): bool
    protected function createApplication()

    {

        
$applicationResolver = static::$applicationResolver ?: function () {

            if (
trait_exists(\Tests\CreatesApplication::class)) {

                
$applicationCreator = new class

                {

                    use 
\Tests\CreatesApplication;