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The following code will return the root path for a drupal file system. \Drupal::service('file_system')->realpath(file_default_scheme() . "://") . '/');

In MySQL, the ORDER BY keyword is used for sorting the records ascending(ASC) or descending(DESC), by default it will be on ascending. The default ORDER BY statement will not work with Alpha-Numerical values(The values is mixed of both numbers and strings). To resolve this problem we can use ABS() MySQL function.

Getting the content type using a node id in drupal 8 can be achieved using bundle() function. The following code will return the node object.

The below code will return all the available user roles as an array in drupal 8.