How to Change Variables in the .Env File Dynamically in Laravel

How to change variables in the .env file dynamically in Laravel?

There is no built in way to do that. If you really want to change the contents of the .env file, you'll have to use some kind of string replace in combination with PHP's file writing methods. For some inspiration, you should take a look at the key:generate command: KeyGenerateCommand.php:

$path = base_path('.env');

if (file_exists($path)) {
    file_put_contents($path, str_replace(
        'APP_KEY='.$this->laravel['config']['app.key'], 'APP_KEY='.$key, file_get_contents($path)
    ));
}

After the file path is built and the existence is checked, the command simply replaces APP_KEY=[current app key] with APP_KEY=[new app key]. You should be able to do the same string replacement with other variables.

Last but not least I just wanted to say that it might isn't the best idea to let users change the .env file. For most custom settings I would recommend storing them in the database, however this is obviously a problem if the setting itself is necessary to connect to the database.

How to change php dotenv (.env) variables dynamically in laravel or php?

putenv() work like a charm :

echo env('APP_ENV');
putenv('APP_ENV=testing');
echo env('APP_ENV');

Output:

staging
testing

.env file is unattached ...

Laravel 5.2 dynamic environment variables based on user

Yes it is possible, but not in the .env file. Instead, you can move your logic to middleware:

Step 1: Add default values to the application config

Open your app/config/app.php and add your default values to the existing array.

<?php

return [
    'APP_ID' => '45678',
    'APP_SECRET' => 'abc456',
    ...
];

Step 2: Create a new Middleware

php artisan make:middleware SetAppConfigForUserMiddleware

Edit the file to look like this:

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Config;

class SetAppConfigForUserMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
         $authorizedUser = Auth::user();

        if (!App::runningInConsole() && !is_null($authorizedUser)) {
            Config::set('app.APP_ID', 'appidOfUser' . $authorizedUser->name);
            Config::set('app.APP_SECRET', 'appsecretOfUser' . $authorizedUser->email);
        }
        return $next($request);
    }
}

Step 4: Run your middleware

If you need to set this config for the user in all the web routes you can add to the $middlewareGroups array in app/Http/kernel.php. This will apply the middleware to all the routes inside web.php.

/**
 * The application's route middleware groups.
 *
 * @var array
 */
protected $middlewareGroups = [
    'web' => [
        ...
        \App\Http\Middleware\SetAppConfigForUserMiddleware::class,        
    ],

Step 5: Testing

For example, my Auth:user()->name is "John" and my Auth:user()->email is "john@example.com"

If you put this in your resources/views/home.blade.php

App Id Of User <code>{{config('app.APP_ID')}}</code>
App Secret Of User <code>{{config('app.APP_SECRET')}}</code>

The result will be appidOfUserJohn and appsecretOfUserjohn@example.com.

Dynamically merge .env file old key value in Laravel 5.7

Whenever you change the .env file, you need to refresh the Laravel configuration cache by php artisan config:cache.

So your function will become:

use Illuminate\Support\Facades\Artisan;

private function setEnv($key, $value)
{
    $path = base_path('.env');

    if (file_exists($path)) {

        // Get all the lines from that file
        $lines = explode("\n", file_get_contents($path));
        
        $settings = collect($lines)
            ->filter() // remove empty lines
            ->transform(function ($item) {
                return explode("=", $item, 2);
            }) // separate key and values
            ->pluck(1, 0); // keys to keys, values to values

        $settings[$key] = $value; // set the new value whether it exists or not

        $rebuilt = $settings->map(function ($value, $key) {
            return "$key=$value";
        })->implode("\n"); // rebuild the env file

        file_put_contents($path, $rebuilt); // put the new contents

        Artisan::call("config:cache"); // cache the added/modified parameter
    }
}

How to change environment values dynamically

You can utilize the Config facade to change values at runtime. For example:

Config::set('app.timezone', 'America/Chicago');

At the end of the request, that value is no longer set.

You can also use the config() helper method and pass it an array so it knows it needs to be set:

config(['app.timezone' => 'America/Chicago']);

See also: https://laravel.com/docs/5.1/#configuration

How to set .env values in laravel programmatically on the fly

Since Laravel uses config files to access and store .env data, you can set this data on the fly with config() method:

config(['database.connections.mysql.host' => '127.0.0.1']);

To get this data use config():

config('database.connections.mysql.host')

To set configuration values at runtime, pass an array to the config helper

https://laravel.com/docs/5.3/configuration#accessing-configuration-values

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