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# CLXI. YAZ Functions

# 简介

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/.

> 注: 本扩展已被移动到 PECL 库中且自以下版本起不再被绑定到 PHP 中：5.0.0.

# 安装

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:

例子 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`).

警告
IMAP 扩展模块不能和 recode 扩展模块，YAZ 扩展模块以及 Cyrus 扩展模块同时使用。因为它们使用了相同的内部符号。

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

# 运行时配置

这些函数的行为受 `php.ini` 的影响。

表格 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.

有关 PHP_INI_* 常量进一步的细节与定义参见附录 G。

# 资源类型

本扩展模块未定义任何资源类型。

# 预定义常量

本扩展模块未定义任何常量。

# 范例

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.

例子 2. 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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