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yaz_scan (PHP 4 >= 4.0.5, PECL) yaz_scan -- Prepares for a scan 说明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.
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).
例
例子 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 />";
}
}
?>
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yaz_scan_result