This extension offers a PHP interface to the YAZ toolkit that implements the Z39.50 Protocol for Information Retrieval. With this extension you can easily implement a Z39.50 origin (client) that searches or scans Z39.50 targets (servers) in parallel.
The module hides most of the complexity of Z39.50 so it should be fairly easy to use. It supports persistent stateless connections very similar to those offered by the various RDB APIs that are available for PHP. This means that sessions are stateless but shared amongst users, thus saving the connect and initialize phase steps in most cases.
Compile YAZ (ANSI/NISO Z39.50 support) and install it. Build PHP with your favourite modules and add option --with-yaz[=DIR]. Your task is roughly the following:
gunzip -c php-4.3.X.tar.gz|tar xf - gunzip -c yaz-2.0.tar.gz|tar xf - cd yaz-2.0 ./configure --prefix=/usr make make install cd ../php-4.3.X. ./configure --with-yaz=/usr/bin make make install
If you are using YAZ as a shared extension, add (or uncomment) the following line in php.ini on Unix:
On windows, php_yaz.dll depend on yaz.dll. You'll find yaz.dll in sub directory dlls in the Win32 zip archive. Copy yaz.dll to a directory in your PATH environment (c:\winnt\system32 or c:\windows\system32).
Замечание: The above problem is solved in version 2.0 of YAZ.
Поведение этих функций находится в зависимости от установок в php.ini.
Таблица 1. YAZ configuration options
PHP/YAZ keeps track of connections with targets (Z-Associations). A resource represents a connection to a target.
The script below demonstrates the parallel searching feature of the API. When invoked with no arguments it prints a query form; else (arguments are supplied) it searches the targets as given in array host.
Пример 1. Parallel searching using Yaz