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# yaz_sort

(PHP 4 >= 4.1.0)

yaz_sort -- Sets sorting criteria

## Description

int yaz_sort ( int id, string criteria)

This function sets sorting criteria and enables Z39.50 Sort. Use this function together with yaz_search() or yaz_present(). Using this function alone doesn't have any effect. If 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. The `criteria` takes the form

`field1 flags1 field2 flags2` ...

where field1 specifies primary attributes for sort, field2 seconds, etc.. The field specifies either 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 sequnce of the following characters which may not be separated by any white space.

Sort Flags

`a`

  Sort ascending

`d`

  Sort descending

`i`

  Case insensitive sorting

`s`

  Case sensitive sorting

Example 1. Sort Criterias

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

    1=4 ia

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

    1=4 ia 1=1003 sa

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