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drupal8变量的存储和设定使用yml文件
variable_get()/variable_set()替换为get()/set()
<?php
// Load a set of configuration out of the active store.
// 'node.settings' refers to the filename of the .yml file, without the extension.
//导入
$config = config('node.settings');
// Access a single value out of the store.
echo $config->get('items_per_page');
// Change a value and save it back to both the active store and the filesystem.
//--改变和保存
$config->set('items_per_page','20');
$config->save();
?>
config 文件存储目录
config/node.settings.yml 文件存储内容
<?php
items_per_page: '10'
?>
详细例子参考：
http://heyrocker.com/how-use-drupal-8-configuration-system