Stats from packagist.com are biased towards newer versions. They are coming from composer users, and if you are using composer, you are a lot more likely to be

Stats from packagist.com are biased towards newer versions. They are coming from composer users, and if you are using composer, you are a lot more likely to be using more or less up to date practices and relatively new version of php. There are millions of legacy projects and wordpress sites that have nothing to do with composer, and they are running on old versions of php much more often.