silverstripe-framework/docs/en/04_Changelogs/3.7.0.md

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# 3.7.0 (unreleased)
## SilverStripe 3.7 and PHP 7.2 and Object subclasses
### For Project Code
SilverStripe 3.7 now supports PHP 7.2, which is exciting, but PHP 7.2 introduces an `object` keyword.
To use it, you can replace any uses of `Object` with `SS_Object` in your own project code.
```diff
-class MyClass extends Object
+class MyClass extends SS_Object
{
public function myFunction()
{
- $foo = Object::has_extension('MyExtension');
+ $foo = SS_Object::has_extension('MyExtension');
}
}
```
You are also reliant on any SilverStripe modules directly using `Object` to upgrade their codebase.
Matches for `SS_Object` in the module codebase will tell you it's been upgraded.
A search for `extends Object` or `Object::` isn't fool proof, but will give you an indication
that the module still needs to be upgraded. If in doubt, check the module README.
### For Module Authors
If you are publishing a 3.x-compatible module that directly references the `Object` class,
we recommend that you replace all references to `Object` with `SS_Object`,
and add the following line to your module's `_config.php`
in order to support both current SilverStripe 3.x and SilverStripe 3.7 releases running on PHP 7.2:
```php
// Ensure compatibility with PHP 7.2 ("object" is a reserved word),
// with SilverStripe 3.6 (using Object) and SilverStripe 3.7 (using SS_Object)
if (!class_exists('SS_Object')) class_alias('Object', 'SS_Object');
```
Don't forget to mention explicit PHP 7.2 and SilverStripe 3.7 compatibility in your module README.
Note that in SilverStripe 4.x, the `Object` class was deleted so there isnt an `SS_Object` class there either
(see [https://docs.silverstripe.org/en/4/changelogs/4.0.0/](changelog))