yaz_scan
(PHP 4 >= 4.0.5, PECL yaz:0.9-1.0.9)
yaz_scan — Prepares for a scan
说明
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.
参数
- id
-
The connection resource returned by yaz_connect().
- type
-
Currently only type rpn is 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) and stepSize (preferred step size).
返回值
无返回值。
范例
Example#1 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 />";
}
}
?>
