Update .env value - Laravel 5.8

I create a route

Route::get('/env/{flag}/{value}','GeneralController@envUpdate');

Then, I call it

http://localhost/env/MAIL_REPORT/false

that will trigger this function

public function envUpdate($flag,$value)
{
    //dd($flag,$value); 👉🏼 MAIL_REPORT,  false

    function setEnv($name, $value)
    {
        //make sure to run : sudo chmod 777 .env
        $path = base_path('.env');
        if (file_exists($path)) {
            file_put_contents($path, str_replace(
                $name . '=' . env($name), $name . '=' . $value, file_get_contents($path)
            ));
        }
    }
    setEnv($flag,(string)$value);

    dd(env((string)$flag));

    return env((string)$flag);

}

I kept getting true because in my .env does not seem to be updated

MAIL_REPORT=true

I suppose to have MAIL_REPORT=false

Note : I already ran : sudo chmod 777 .env

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Questions

How would one go about and debug this further ?

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I'm open to any suggestions at this moment.

Any hints/suggestions / helps on this be will be much appreciated!

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