The tap function accepts two arguments: an arbitrary $value and a closure. The $value will be passed to the closure and then be returned by the tap function. The return value of the closure is irrelevant:
<?php $user = tap(User::first(), function ($user) {
    $user->name = 'taylor';

    $user->save();
});
<?php             return Octane::invokeRoute($request, $request->getMethod(), '/'.$request->path());

        }



        return tap($this->sandbox->make(Kernel::class)->handle($request), function ($response) use ($request) {

            $this->dispatchEvent($this->sandbox, new RequestHandled($this->sandbox, $request, $response));

        });

    }
<?php         $record = $this->table->get($key);



        if ($this->recordIsFalseOrExpired($record)) {

            return tap($value, fn ($value) => $this->put($key, $value, static::ONE_YEAR));

        }



        return tap((int) (unserialize($record['value']) + $value), function ($value) use ($key, $record) {
<?php             return tap($value, fn ($value) => $this->put($key, $value, static::ONE_YEAR));

        }



        return tap((int) (unserialize($record['value']) + $value), function ($value) use ($key, $record) {

            $this->put($key, $value, $record['expiration'] - Carbon::now()->getTimestamp());

        });

    }
<?php     protected function ensureRoadRunnerBinaryMeetsRequirements($roadRunnerBinary)

    {

        $version = tap(new Process([$roadRunnerBinary, '--version'], base_path()))

            ->run()

            ->getOutput();
<?php     protected function downloadRoadRunnerBinary()

    {

        tap(new Process(array_filter([

            (new PhpExecutableFinder)->find(),

            './vendor/bin/rr',

            'get-binary',

            '-n',

            '--ansi',

        ]), base_path(), null, null, null))->mustRun(

            fn ($type, $buffer) => $this->output->write($buffer)

        );
<?php             );

        }



        return tap(new Process([

            (new ExecutableFinder)->find('node'),

            'file-watcher.js',

            json_encode(collect(config('octane.watch'))->map(fn ($path) => base_path($path))),

        ], realpath(__DIR__.'/../../../bin'), null, null, null))->start();

    }
<?php             ['roadrunner', 'swoole'],

        );



        return (int) ! tap(match ($server) {

            'swoole' => $this->installSwooleServer(),

            'roadrunner' => $this->installRoadRunnerServer(),

            default => $this->invalidServer($server),

        }, function ($installed) use ($server) {

            if ($installed) {

                $this->updateEnvironmentFile($server);



                $this->callSilent('vendor:publish', ['--tag' => 'octane-config', '--force' => true]);



                $this->info('Octane installed successfully.');

            }

        });

    }
<?php         $this->forgetEnvironmentVariables();



        $server = tap(new Process(array_filter([

            $roadRunnerBinary,

            '-c', $this->configPath(),

            '-o', 'http.address='.$this->option('host').':'.$this->option('port'),

            '-o', 'server.command='.(new PhpExecutableFinder)->find().' ./vendor/bin/roadrunner-worker',

            '-o', 'http.pool.num_workers='.$this->workerCount(),

            '-o', 'http.pool.max_jobs='.$this->option('max-requests'),

            '-o', 'rpc.listen=tcp://'.$this->option('host').':'.$this->rpcPort(),

            '-o', 'http.pool.supervisor.exec_ttl='.$this->maxExecutionTime(),

            '-o', 'http.static.dir=public',

            '-o', 'http.middleware='.config('octane.roadrunner.http_middleware', 'static'),

            '-o', 'logs.mode=production',

            '-o', app()->environment('local') ? 'logs.level=debug' : 'logs.level=warning',

            '-o', 'logs.output=stdout',

            '-o', 'logs.encoding=json',

            'serve',

        ]), base_path(), [

            'APP_ENV' => app()->environment(),

            'APP_BASE_PATH' => base_path(),

            'LARAVEL_OCTANE' => 1,

        ]))->start();



        $serverStateFile->writeProcessId($server->getPid());
<?php         $this->forgetEnvironmentVariables();



        $server = tap(new Process([

            (new PhpExecutableFinder)->find(), 'swoole-server', $serverStateFile->path(),

        ], realpath(__DIR__.'/../../bin'), [

            'APP_ENV' => app()->environment(),

            'APP_BASE_PATH' => base_path(),

            'LARAVEL_OCTANE' => 1,

        ]))->start();



        return $this->runServer($server, $inspector, 'swoole');

    }
<?php             default => $this->invalidServer($server),

        };



        return ! tap($isRunning, function ($isRunning) {

            $isRunning

                ? $this->info('Octane server is running.')

                : $this->info('Octane server is not running.');

        });

    }
<?php     {

        $config = $event->sandbox->make('config');



        tap($event->sandbox->make('translator'), function ($translator) use ($config) {

            $translator->setLocale($config->get('app.locale'));

            $translator->setFallback($config->get('app.fallback_locale'));

        });

    }

}
<?php     public function handle($event): void

    {

        if ($event->exception) {

            tap($event->sandbox, function ($sandbox) use ($event) {

                if ($event->exception instanceof DdException) {

                    return;

                }



                if ($sandbox->environment('local', 'testing')) {

                    Stream::throwable($event->exception);

                }



                $sandbox[ExceptionHandler::class]->report($event->exception);

            });

        }

    }

}
<?php             ],

        ] = $this->serverStateFile->read();



        tap($this->processFactory->createProcess([

            $this->findRoadRunnerBinary(),

            'reset',

            '-o', "rpc.listen=tcp://$host:$rpcPort",

        ], base_path()))->start()->waitUntil(function ($type, $buffer) {

            if ($type === Process::ERR) {

                throw new RuntimeException('Cannot reload RoadRunner: '.$buffer);

            }
<?php     protected function bootWorker($server)

    {

        try {

            return tap(new Worker(

                new ApplicationFactory($this->basePath),

                $this->workerState->client = new SwooleClient

            ))->boot([

                'octane.cacheTable' => $this->workerState->cacheTable,

                Server::class => $server,

                WorkerState::class => $this->workerState,
<?php         $exception = new Exception('foo');



        $exceptionHandler = tap(Mockery::mock(ExceptionHandler::class), fn ($mock) => $mock

            ->shouldReceive('report')

            ->once()

            ->with($exception));



        Mockery::mock('alias:'.Stream::class)

            ->shouldReceive('throwable')