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mysql> select * from some_table; +----+-----------+---------+ | id | region_id | user_id | +----+-----------+---------+ | 1 | 1 | 106 | | 4 | 7 | 124 | | 3 | 3 | 124 | +----+-----------+---------+ 3 rows in set (0.00 sec)
CREATE TABLE `some_table` ( `id` int(8) NOT NULL AUTO_INCREMENT, `region_id` int(8) NOT NULL, `user_id` int(8) NOT NULL, PRIMARY KEY (`id`), KEY `region_id` (`region_id`), KEY `user_id` (`user_id`) ) ENGINE=MyISAM AUTO_INCREMENT=5 DEFAULT CHARSET=utf8

array_map($callback, $array), где $callback - та самая функция, а $array, очевидно массив.array_reduce($array, $callback).