db\ActiveRecordInterface getPrimaryKey()

Whether to return the primary key value as an array. If true, the return value will be an array with attribute names as keys and attribute values as values. Note that for composite primary keys, an array will always be returned regardless of this parameter value.

The primary key value. An array (attribute name => attribute value) is returned if the primary key is composite or $asArray is true. A string is returned otherwise (null will be returned if the key value is null).