helpers\BaseArrayHelper multisort()

The array to be sorted. The array will be modified after calling this method.

The key(s) to be sorted by. This refers to a key name of the sub-array elements, a property name of the objects, or an anonymous function returning the values for comparison purpose. The anonymous function signature should be: function($item). To sort by multiple keys, provide an array of keys here.

The sorting direction. It can be either SORT_ASC or SORT_DESC. When sorting by multiple keys with different sorting directions, use an array of sorting directions.

The PHP sort flag. Valid values include SORT_REGULAR, SORT_NUMERIC, SORT_STRING, SORT_LOCALE_STRING, SORT_NATURAL and SORT_FLAG_CASE. Please refer to PHP manual for more details. When sorting by multiple keys with different sort flags, use an array of sort flags.

if the $direction or $sortFlag parameters do not have correct number of elements as that of $key.