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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 321912 $ -->
<refentry xml:id="mysqlnduhconnection.getfieldcount" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>MysqlndUhConnection::getFieldCount</refname>
<refpurpose>Returns the number of columns for the most recent query</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>int</type><methodname>MysqlndUhConnection::getFieldCount</methodname>
<methodparam><type>mysqlnd_connection</type><parameter>connection</parameter></methodparam>
</methodsynopsis>
<para>
Returns the number of columns for the most recent query.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>connection</parameter></term>
<listitem>
<para>
Mysqlnd connection handle. Do not modify!
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Number of columns.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<function>MysqlndUhConnection::getFieldCount</function> is not only executed
after the invocation of a user space API call which maps directly to it but also
called internally.
</para>
<para>
<example>
<title><function>MysqlndUhConnection::getFieldCount</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
class proxy extends MysqlndUhConnection {
public function getFieldCount($res) {
printf("%s(%s)\n", __METHOD__, var_export(func_get_args(), true));
$ret = parent::getFieldCount($res);
printf("%s returns %s\n", __METHOD__, var_export($ret, true));
return $ret;
}
}
mysqlnd_uh_set_connection_proxy(new proxy());
$mysqli = new mysqli("localhost", "root", "", "test");
$mysqli->query("WILL_I_EVER_LEARN_SQL?");
var_dump($mysqli->field_count);
$mysqli->query("SELECT 1, 2, 3 FROM DUAL");
var_dump($mysqli->field_count);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
proxy::getFieldCount(array (
0 => NULL,
))
proxy::getFieldCount returns 0
int(0)
proxy::getFieldCount(array (
0 => NULL,
))
proxy::getFieldCount returns 3
proxy::getFieldCount(array (
0 => NULL,
))
proxy::getFieldCount returns 3
int(3)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member>
<function>mysqlnd_uh_set_connection_proxy</function>
</member>
<member>
<function>mysqli_field_count</function>
</member>
</simplelist>
</para>
</refsect1>
</refentry>
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