yaz_scan_result returns terms and associated information as received from the server in the last performed yaz_scan.
The connection resource returned by yaz_connect.
If given, this array will be modified to hold additional information taken from the Scan Response:
number - Number of entries returned
stepsize - Step size
position - Position of term
status - Scan status
Returns an array (0..n-1) where n is the number of terms returned. Each value is a pair where the first item is the term, and the second item is the result-count.