forked from https://github.com/symfony/symfony
12a01a26c9
This PR was merged into the 4.3-dev branch.
Discussion
----------
Nullable environment variable processor
| Q | A
| ------------- | ---
| Branch? | master
| Bug fix? | no
| New feature? | yes
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets |
| License | MIT
| Doc PR | todo
Hey there,
Because environment variables are strings by design, empty environment variables are evaluated to `""` by default.
In the same way, `MY_ENV_VAR=null` will be evaluated to `"null"`, as a string.
What I suggest is to allow some environment variables to be evaluated to `null` (the real one) when their strings are _blank_ or equal _null_, _Null_ or _NULL_.
This can be easily done through a new `nullable` processor:
```bash
# .env
API_KEY=
```
```yaml
# config/services.yaml
services:
FooService:
arguments:
$apiKey: %env(nullable:API_KEY)%
```
```php
# src/Services/FooService
namespace App\Services;
final class FooService
{
/**
* @var string|null
*/
private $apiKey;
/**
* FooService constructor.
*/
public function __construct(?string $apiKey)
{
$this->apiKey = $apiKey;
}
public function doSomething()
{
// Free plan
if (null === $this->apiKey) {
// ...
}
}
}
```
That's an example that comes to my mind but there can be many others.
This can also help in using null coalesce operators in constructors instead of checking if a string equals `""` (which is very PHP4 style).
Of course it can be used in conjunction with other types, i.e. `%env(float:nullable:SOME_OPTIONAL_FLOAT_ENV_VAR)%`.
What do you think?
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| .travis.yml | ||
| CHANGELOG-4.0.md | ||
| CHANGELOG-4.1.md | ||
| CHANGELOG-4.2.md | ||
| CODE_OF_CONDUCT.md | ||
| composer.json | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS.md | ||
| LICENSE | ||
| link | ||
| phpunit | ||
| phpunit.xml.dist | ||
| README.md | ||
| UPGRADE-4.0.md | ||
| UPGRADE-4.1.md | ||
| UPGRADE-4.2.md | ||
| UPGRADE-4.3.md | ||
| UPGRADE-5.0.md | ||
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