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Add platform version to FAQ to help user specifying PHP version #360

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12 changes: 12 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -129,3 +129,15 @@ section of composer.json:
### How do I switch from packagist.drupal-composer.org to packages.drupal.org?

Follow the instructions in the [documentation on drupal.org](https://www.drupal.org/docs/develop/using-composer/using-packagesdrupalorg).

### How do I specify a PHP version ?

Currently Drupal 8 supports PHP 5.5.9 as minimum version (see [Drupal 8 PHP requirements](https://www.drupal.org/docs/8/system-requirements/drupal-8-php-requirements)), however it's possible that a `composer update` will upgrade some package that will then require PHP 7+.

To prevent this you can add this code to specify the PHP version you want to use in the `config` section of `composer.json`:
```json
"config": {
"sort-packages": true,
"platform": {"php": "5.5.9"}
},
```