Laravel 5 : Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE)

You need to install PHP version 7.1 because nullable types were introduced in 7.1:

?string $value

And from the Laravel docs:

You will need to make sure your server meets the following requirements:
PHP >= 7.1.3

php laravel smtp reset-password

For php7.0 only

If your server doesn't have php 7.1 and above and you are only restricted to use php7.0 do as below:

Delete vendor folder
Delete composer.lock file
Add this to composer.json file under config
```
"platform": {   "php": "7.0.0"}
```

As well, ensure PHP version under require is set to 7.0.0 as shown below in config.platform.php:

    "config": {        "platform": {            "php": "7.0.0"        }     }

This now will make sure that only dependencies compatible with php7.0 are installed.

CodeHunter