PHP: YAZ Functions - Manual

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Last updated: Sat, 27 Jan 2007

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# CLXXXI. YAZ Functions

# Введение

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/.

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

# Установка

Obtain YAZ (ANSI/NISO Z39.50 support) and install it. YAZ can be fetched in source or in various prebuilt packages from the YAZ archive. Systems such as Debian GNU/Linux, Suse Linux, FreeBSD also has YAZ as part of their distribution.

For the PHP 4 series, the YAZ extension is bundled (but not YAZ itself) Build PHP with your favorite modules and add option `--with-yaz[=DIR]`.

Пример 1. YAZ compilation for PHP 4 on Unix

    gunzip -c php-4.4.X.tar.gz|tar xf -
    gunzip -c yaz-2.1.8.tar.gz|tar xf -
    cd yaz-2.1.8
    ./configure --prefix=/usr
    make
    sudo make install
    cd ../php-4.4.X.
    ./configure --with-yaz=/usr/bin
    make
    sudo make install

For PHP 5, the YAZ extension is in PECL and is installed as a shared object/dll. If you have pear installed the easiest way to download, configure and install the YAZ extension is by using the pear command.

Пример 2. Installation of PECL YAZ on GNU/Debian Linux

On a Debian GNU/Linux system the following installs YAZ and PECL YAZ:

    sudo apt-get install libyaz-dev
    sudo pear install yaz

On Windows, `php_yaz.dll` depend on `yaz.dll`. The `yaz.dll` is part of the Win32 ZIP from the PHP site. It is also part of the Windows YAZ install available from the YAZ WIN32 area.

Внимание
The PHP 5.0.5 Win32 zip includes a too old version of `yaz.dll` (version 1.9.1 < required version 2.0.13). If that's the case use the `yaz.dll` from a newer YAZ WIN32 install.

On windows, don't forget to add the PHP directory to the PATH, so that the `yaz.dll` file can be found by the system.

If you are using YAZ as a shared extension, add (or uncomment) the following line in `php.ini` on Unix:

    extension=yaz.so

And for Windows:

    extension=php_yaz.dll

Внимание
Расширение IMAP не может использоваться вместе с расширениями перекодировки или YAZ. Это связано с тем фактом, что они оба используют один и тот же внутренний символ.

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

# Настройка во время выполнения

Поведение этих функций зависит от установок в `php.ini`.

Таблица 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.

Для подробного описания констант PHP_INI_*, обратитесь к документации функции ini_set().

# Типы ресурсов

Данное расширение не определяет никакие типы ресурсов.

# Предопределенные константы

Данное расширение не определяет никакие константы.

# Примеры

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 3. Parallel searching using Yaz

`<?php
$host=$_REQUEST[host];
$query=$_REQUEST[query];
$num_hosts = count($host);
if (empty($query) || count($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="query" />
<input type="submit" name="action" value="Search" />
</form>
';
} else {
echo 'You searched for ' . htmlspecialchars($query) . '<br />';
for ($i = 0; $i < $num_hosts; $i++) {
$id[] = yaz_connect($host[$i]);
yaz_syntax($id[$i], "usmarc");
yaz_range($id[$i], 1, 10);
yaz_search($id[$i], "rpn", $query);
}
yaz_wait();
for ($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>';
}
}
?>`

add a note User Contributed Notes
YAZ Functions
23-Oct-2005 03:00
`Straightforward Steps to get PHP Yaz to work on win32:
Download latest verion of php_yaz.dll and copy to your PHP extensions directory
http://ftp.indexdata.dk/pub/phpyaz/
Download latest version of YAZ toolkit and install it
http://www.indexdata.dk/yaz/
Go to the YAZ toolkit directory
(Most likely C:\Program Files\YAZ\bin)
Copy the 4 DLL files in that folder into your win32 directory
Uncomment the "extention=php_yaz.dll;" line in php.ini
Restart your web server.
Uninstall the YAZ toolkit if you wish.`
cstdenis at hotmail dot com
15-Jul-2004 06:17
`For those wondering what it is:
"This standard defines a client/server based service and protocol for
Information Retrieval. It specifies procedures and formats for a client to search a
database provided by a server, retrieve database records, and perform related
information retrieval functions. The protocol addresses communication between
information retrieval applications at the client and server; it does not address interaction
between the client and the end-user."`
add a note
yaz_addinfo xslt_setopt

Last updated: Sat, 27 Jan 2007
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