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Examples

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.

Example #1 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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