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yaz_scan
Prepares for a scan
(PHP 4 >= 4.0.5, PECL yaz:0.9-1.0.9)
void yaz_scan ( resource id, string type, string startterm [, array flags] )
This function prepares for a Z39.50 Scan Request on the specified connection.
To actually transfer the Scan Request to the server and receive the Scan Response, yaz_wait() must be called. Upon completion of yaz_wait() call yaz_error() and yaz_scan_result() to handle the response.
Parameters
- id
The connection resource returned by yaz_connect().
- type
Currently only type
rpnis supported.- startterm
Starting term point for the scan.
The form in which the starting term is specified is given by parameter type.
The syntax this parameter is similar to the RPN query as described in yaz_search(). It consists of zero or more
@attr-operator specifications, then followed by exactly one token.- flags
This optional parameter specifies additional information to control the behaviour of the scan request. Three indexes are currently read from the flags array:
number(number of terms requested),position(preferred position of term) andstepSize(preferred step size).
Examples
Example 2678. PHP function that scans titles
<?php
function scan_titles($id, $startterm)
{
yaz_scan($id, "rpn", "@attr 1=4 " . $startterm);
yaz_wait();
$errno = yaz_errno($id);
if ($errno == 0) {
$ar = yaz_scan_result($id, &$options);
echo 'Scan ok; ';
foreach ($options as $key => $val) {
echo "$key = $val ";
}
echo '<br /><table>';
while (list($key, list($k, $term, $tcount)) = each($ar)) {
if (empty($k)) continue;
echo "<tr><td>$term</td><td>$tcount</td></tr>";
}
echo '</table>';
} else {
echo "Scan failed. Error: " . yaz_error($id) . "<br />";
}
}
?>