Specifies a range of records to retrieve - Справочник: PHP5.4

void yaz_range ( resource $id , int $start , int $number )

Specifies a range of records to retrieve.

This function should be called before yaz_search() or yaz_present().

id: The connection resource returned by yaz_connect().
start: Specifies the position of the first record to be retrieved. The records numbers goes from 1 to yaz_hits().
number: Specifies the number of records to be retrieved.

Эта функция не возвращает значения после выполнения.