file_exists

<?php     {

        $path = $this->basePath.'/bootstrap/app.php';



        if (! file_exists($path)) {

            throw new RuntimeException("Application bootstrap file not found [{$path}].");

        }

<?php         $process = Process::fromShellCommandline($command, null, null, null, null);



        if ('\\' !== DIRECTORY_SEPARATOR && file_exists('/dev/tty') && is_readable('/dev/tty')) {

            try {

                $process->setTty(true);

            } catch (RuntimeException $e) {

<?php         $phpPath = (new PhpExecutableFinder)->find();



        if (! file_exists($composerPath)) {

            $composerPath = (new ExecutableFinder())->find('composer');

        }

<?php     protected function findRoadRunnerBinary(): ?string

    {

        if (file_exists(base_path('rr'))) {

            return base_path('rr');

        }