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Sets sorting criteria (PHP 4 >= 4.0.7, PECL yaz:0.9-1.0.9)
void yaz_sort ( resource id, string criteria )

This function sets sorting criteria and enables Z39.50 Sort.

Call this function before yaz_search(). Using this function alone does not have any effect. When used in conjunction with yaz_search(), a Z39.50 Sort will be sent after a search response has been received and before any records are retrieved with Z39.50 Present (yaz_present().



The connection resource returned by yaz_connect().


A string that takes the form field1 flags1 field2 flags2 where field1 specifies the primary attributes for sort, field2 seconds, etc..

The field specifies either a numerical attribute combinations consisting of type=value pairs separated by comma (e.g. 1=4,2=1) ; or the field may specify a plain string criteria (e.g. title. The flags is a sequence of the following characters which may not be separated by any white space.

Sort Flags


Sort ascending


Sort descending


Case insensitive sorting


Case sensitive sorting

Return Values

No value is returned.


Example 2680. Sort Criterias

To sort on Bib1 attribute title, case insensitive, and ascending you would use the following sort criteria:

1=4 ia

If the secondary sorting criteria should be author, case sensitive and ascending you would use:

1=4 ia 1=1003 sa