CLXVII. YAZ Functions
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.
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
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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: commands usually suffice:
sudo apt-get install libyaz-dev
sudo pear install yaz
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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:
And for Windows:
| 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.
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().
Данное расширение не определяет никакие типы ресурсов.
Данное расширение не определяет никакие константы.
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>';
}
}
?>
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- Содержание
- yaz_addinfo -- Returns additional error information
- yaz_ccl_conf -- Configure CCL parser
- yaz_ccl_parse -- Invoke CCL Parser
- yaz_close -- Close YAZ connection
- yaz_connect -- Prepares for a connection to a Z39.50 server
- yaz_database -- Specifies the databases within a session
- yaz_element -- Specifies Element-Set Name for retrieval
- yaz_errno -- Returns error number
- yaz_error -- Returns error description
- yaz_es_result -- Inspects Extended Services Result
- yaz_get_option -- Returns value of option for connection
- yaz_hits -- Returns number of hits for last search
- yaz_itemorder -- Prepares for Z39.50 Item Order with an ILL-Request package
- yaz_present -- Prepares for retrieval (Z39.50 present)
- yaz_range -- Specifies a range of records to retrieve
- yaz_record -- Returns a record
- yaz_scan_result -- Returns Scan Response result
- yaz_scan -- Prepares for a scan
- yaz_schema -- Specifies schema for retrieval
- yaz_search -- Prepares for a search
- yaz_set_option -- Sets one or more options for connection
- yaz_sort -- Sets sorting criteria
- yaz_syntax -- Specifies the preferred record syntax for retrieval
- yaz_wait -- Wait for Z39.50 requests to complete
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