php-doc-en/reference/mysqlnd_uh/mysqlnduhconnection/getfieldcount.xml

<?xml version="1.0" encoding="utf-8"?>
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<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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