functions/helloworld_pubsub/SampleIntegrationTest.php [66:84]:
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    public static function startFunctionFramework(): void
    {
        $port = getenv('PORT') ?: '8080';
        $php = (new PhpExecutableFinder())->find();
        $uri = 'localhost:' . $port;

        // https://symfony.com/doc/current/components/process.html#usage
        self::$process = new Process([$php, '-S', $uri, 'vendor/bin/router.php'], null, [
            'FUNCTION_SIGNATURE_TYPE' => 'cloudevent',
            'FUNCTION_TARGET' => 'helloworldPubsub',
        ]);
        self::$process->start();

        // Initialize an HTTP client to drive requests.
        self::$client = new Client(['base_uri' => 'http://' . $uri]);

        // Short delay to ensure PHP server is ready.
        sleep(1);
    }
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functions/helloworld_storage/SampleIntegrationTest.php [104:122]:
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    public static function startFunctionFramework(): void
    {
        $port = getenv('PORT') ?: '8080';
        $php = (new PhpExecutableFinder())->find();
        $uri = 'localhost:' . $port;

        // https://symfony.com/doc/current/components/process.html#usage
        self::$process = new Process([$php, '-S', $uri, 'vendor/google/cloud-functions-framework/router.php'], null, [
            'FUNCTION_SIGNATURE_TYPE' => 'cloudevent',
            'FUNCTION_TARGET' => 'helloGCS',
        ]);
        self::$process->start();

        // Initialize an HTTP client to drive requests.
        self::$client = new Client(['base_uri' => 'http://' . $uri]);

        // Short delay to ensure PHP server is ready.
        sleep(1);
    }
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