How to hide .env passwords in Laravel whoops output?

First of all, love the solution by Jeff above.

2nd, if like me you wanna hide all the env variables while still use whoops, here is a solution:

'debug_blacklist' => [
        '_COOKIE' => array_keys($_COOKIE),
        '_SERVER' => array_keys($_SERVER),
        '_ENV' => array_keys($_ENV),        
    ],

Output:

EDIT: Legend has it that since laravel 7x you would need debug_hide key instead

As of Laravel 5.5.13, you can censor variables by listing them under the key debug_blacklist in config/app.php. When an exception is thrown, whoops will mask these values with asterisks * for each character.

For example, given this config/app.php

return [

    // ...

    'debug_blacklist' => [
        '_ENV' => [
            'APP_KEY',
            'DB_PASSWORD',
            'REDIS_PASSWORD',
            'MAIL_PASSWORD',
            'PUSHER_APP_KEY',
            'PUSHER_APP_SECRET',
        ],
        '_SERVER' => [
            'APP_KEY',
            'DB_PASSWORD',
            'REDIS_PASSWORD',
            'MAIL_PASSWORD',
            'PUSHER_APP_KEY',
            'PUSHER_APP_SECRET',
        ],
        '_POST' => [
            'password',
        ],
    ],
];

Results in this output: