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# CXXXIX. YAZ Functions

# Introdução

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 among users, thus saving the connect and initialize phase steps in most cases.

YAZ is available at http://www.indexdata.dk/yaz/. You can find news information, example scripts, etc. for this extension at http://www.indexdata.dk/phpyaz/.

> Nota: This extension has been moved to the PECL repository and is no longer bundled with PHP as of PHP 5.0.0.

# Instalação

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:

Exemplo 1. YAZ compilation
    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:

    extension=php_yaz.so

And for Windows:

    extension=php_yaz.dll

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`).

Atenção
A extensão IMAP não pode ser utilizada em conjunto com as extensões recode, YAZ ou or Cyrus. Isto ocorre pelo fato de elas compartilham os mesmos símbolos internos.

> Nota: The above problem is solved in version 2.0 of YAZ.

# Configurações em execução

O comportamento dessas funções podem ser modificado pelas configurações do `php.ini`.

Tabela 1. YAZ configuration options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
yaz.max_links | "100" | PHP_INI_ALL | Available since PHP 4.3.0.
yaz.log_file | NULL | PHP_INI_ALL | Available since PHP 4.3.0.

Para mais detalhes e definições das constantes PHP_INI_*, veja a documentação de ini_set().

# Tipos Resource

Esta extensão não possui nenhum tipo resource.

# Constantes pré-definidas

Esta extensão não possui nenhuma constante.

# Exemplos

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.

Exemplo 2. Parallel searching using Yaz
`<?php $num_hosts = count($host); if (empty($term) || count($host) == 0) { echo '<form method="get"> <input type="checkbox" name="host[]" value="bagel.indexdata.dk/gils" /> GILS test <input type="checkbox" name="host[]" value="localhost:9999/Default" /> local test <input type="checkbox" checked="checked" name="host[]" value="z3950.loc.gov:7090/voyager" /> Library of Congress <br /> RPN Query: <input type="text" size="30" name="term" /> <input type="submit" name="action" value="Search" /> </form> '; } else { echo 'You searched for ' . htmlspecialchars($term) . '<br />'; for ($i = 0; $i < $num_hosts; $i++) { $id[] = yaz_connect($host[$i]); yaz_range($id[$i], 1, 10); yaz_search($id[$i], "rpn", $term); } yaz_wait(); for ($i = 0; $i < $num_hosts; $i++) { echo '<hr />' . $host[$i] . ':'; $error = yaz_error($id[$i]); if (!empty($error)) { echo "Error: $error"; } else { $hits = yaz_hits($id[$i]); echo "Result Count $hits"; } echo '<dl>'; for ($p = 1; $p <= 10; $p++) { $rec = yaz_record($id[$i], $p, "string"); if (empty($rec)) continue; echo "<dt><b>$p</b></dt><dd>"; echo nl2br($rec); echo "</dd>"; } echo '</dl>'; } } ?>`

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