YAZ functionsYAZ
&reftitle.intro;
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 SQL APIs that are available
for PHP. This means that sessions are stateless but shared amongst
users, thus saving the connect and initialize phase steps in most
cases.
YAZ is available at &url.yaz;. You can find news information,
example scripts, etc. for this extension at &url.yaz-phpyaz;.
&reftitle.install;
Compile YAZ and install it. Build PHP with your favourite
modules and add option
--with-yaz.
Your task is roughly the following:
&reftitle.runtime;
&no.config;
&reftitle.resources;
&no.resource;
&reftitle.constants;
&no.constants;
&reftitle.examples;
PHP/YAZ keeps track of connections with targets
(Z-Associations). A positive integer represents the ID of a
particular association.
<function>Parallel searching using YAZ</function>
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 in array
host.
GILS test
local test
BELL Labs Library
RPN Query:
';
} else {
echo 'You searced for ' . htmlspecialchars($term) . ' ';
for ($i = 0; $i < $num_hosts; $i++) {
$id[] = yaz_connect($host[$i]);
yaz_syntax($id[$i],"sutrs");
yaz_search($id[$i],"rpn",$term);
}
yaz_wait();
for ($i = 0; $i < $num_hosts; $i++) {
echo '' . $host[$i] . ":";
$error = yaz_error($id[$i]);
if (!empty($error)) {
echo "Error: $error";
} else {
$hits = yaz_hits($id[$i]);
echo "Result Count $hits";
}
echo '
';
for ($p = 1; $p <= 10; $p++) {
$rec = yaz_record($id[$i],$p,"string");
if (empty($rec)) continue;
echo "