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

NameDefaultChangeableChangelog
yaz.max_links"100"PHP_INI_ALLAvailable since PHP 4.3.0.
yaz.log_fileNULLPHP_INI_ALLAvailable since PHP 4.3.0.
有关 PHP_INI_* 常量进一步的细节与定义参见 附录 H

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。

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>';
    }
}
?>

目录
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