Пресловутый mysqli_fetch_assoc() в WP

Т.е. тебе плевать на мою психику. ОК:

Код (Text):

1. * @param string $query  SQL query.
2. * @param string $output Optional. Any of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants.
3. *                       With one of the first three, return an array of rows indexed from 0 by SQL result row number.
4. *                       Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object. ( ->column = value ), respectively.
5. *                       With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value.
6. *                       Duplicate keys are discarded.
7. * @return array|object|null Database query results

Дефолтное значение параметра – OBJECT
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Т.е. имеем массив объектов.