(PHP 4 >= 4.0.5, PECL yaz >= 0.9.0)
yaz_present — Prepares for retrieval (Z39.50 present)
$id): boolThis function prepares for retrieval of records after a successful search.
The yaz_range() function should be called prior to this function to specify the range of records to be retrieved.
成功时返回 true， 或者在失败时返回 false。