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https://github.com/sigmasternchen/php-doc-en
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523548cedf
'target'. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@149796 c90b9560-bf6c-de11-be94-00142212c4b1
96 lines
3.3 KiB
XML
96 lines
3.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.9 $ -->
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<!-- splitted from ./en/functions/yaz.xml, last change in rev 1.8 -->
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<refentry id="function.yaz-scan">
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<refnamediv>
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<refname>yaz_scan</refname>
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<refpurpose>Prepares for a scan</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>int</type><methodname>yaz_scan</methodname>
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<methodparam><type>resource</type><parameter>id</parameter></methodparam>
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<methodparam><type>string</type><parameter>type</parameter></methodparam>
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<methodparam><type>string</type><parameter>startterm</parameter></methodparam>
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<methodparam choice="opt"><type>array</type><parameter>flags</parameter></methodparam>
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</methodsynopsis>
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<para>
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This function prepares for a Z39.50 Scan Request, where parameter
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<parameter>id</parameter> specifies connection. Starting term
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point for the scan is given by <parameter>startterm</parameter>.
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The form in which the starting term is specified is given by parameter
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<parameter>type</parameter>. Currently only type <literal>rpn</literal>
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is supported. The optional parameter <parameter>flags</parameter>
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specifies additional information to control the behaviour of the
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scan request. Three indexes are currently read from the flags:
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<literal>number</literal> (number of terms requested),
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<literal>position</literal> (preferred position of term) and
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<literal>stepSize</literal> (preferred step size).
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To actually transfer the Scan Request to the server and receive the
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Scan Response, <function>yaz_wait</function> must be called. Upon
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completion of <function>yaz_wait</function> call
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<function>yaz_error</function> and <function>yaz_scan_result</function> to
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handle the response.
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</para>
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<para>
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The syntax of <parameter>startterm</parameter> is similar to the
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RPN query as described in <function>yaz_search</function>. The
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startterm consists of zero or more <literal>@attr</literal>-operator
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specifications, then followed by exactly one token.
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</para>
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<para>
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<example>
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<title>PHP function that scans titles</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function scan_titles($id, $startterm)
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{
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yaz_scan($id, "rpn", "@attr 1=4 " . $startterm);
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yaz_wait();
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$errno = yaz_errno($id);
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if ($errno == 0) {
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$ar = yaz_scan_result($id, &$options);
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echo 'Scan ok; ';
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while (list($key, $val) = each($options)) {
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echo "$key = $val ";
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}
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echo '<br /><table>';
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while (list($key, list($k, $term, $tcount)) = each($ar)) {
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if (empty($k)) continue;
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echo "<tr><td>$term</td><td>$tcount</td></tr>";
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}
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echo '</table>';
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} else {
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echo "Scan failed. Error: " . yaz_error($id) . "<br />";
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}
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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