db_and()
Returns a new DatabaseCondition, set to "AND" all conditions together.
\Drupal\Core\Database\Query\Condition A new Condition object, set to "AND" all conditions together.
as of Drupal 8.0.x, will be removed in Drupal 9.0.0. Create a \Drupal\Core\Database\Query\Condition object, specifying an AND conjunction: new Condition('AND');
\Drupal\Core\Database\Query\Condition
function db_and() { return new Condition('AND'); }
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https://api.drupal.org/api/drupal/core!includes!database.inc/function/db_and/8.1.x