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# yaz_sort

(PHP 4 >= 4.1.0, PHP 5)

yaz_sort -- Sets sorting criteria

## Description

int 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 parameter `criteria` 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

`a`

  Sort ascending

`d`

  Sort descending

`i`

  Case insensitive sorting

`s`

  Case sensitive sorting

예 1. 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

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