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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], 110);
        
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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