laravel/framework — pull request #6727 by tomschlick (2014-12-19 03:14:41+00:00)
Title: Adding array_whitelist() and array_blacklist() functions

check if a value is whitelisted or blacklisted
useful for double checking url parameters like filters & sorts

Example:
```php

/* Controller index */
public function index($sortBy = 'name')
{
$sortBy = array_whitelist($sortBy, ['name', 'age', 'rank'], 'name');

// ...
}

```