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  <refentry id="function.mysqli-stmt-result-metadata">
   <refnamediv>
    <refname>mysqli_stmt_result_metadata</refname>
    <refpurpose>returns result set metadata from a prepared statement</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <para>Procedural style:</para>
    <methodsynopsis>
     <type>mixed</type><methodname>mysqli_stmt_result_metadata</methodname>
     <methodparam><type>object</type><parameter>stmt</parameter></methodparam>
    </methodsynopsis>
    <para>Object oriented style (method):</para>
    <classsynopsis>
     <ooclass><classname>stmt</classname></ooclass>
     <methodsynopsis>
      <type>mixed</type>
      <methodname>result_metadata</methodname>
      <void />
     </methodsynopsis>
    </classsynopsis>     
    <para>
     If a statement passed to <function>mysqli_prepare</function> is one that produces
     a result set, <function>mysqli_stmt_result_metadata</function> returns the result object 
     that can be used to process the meta information such as total number of fields 
     and individual field information. 
    </para>
    <note>
     <para>This result set pointer can be passed as an argument to any of the 
      field-based functions that process result set metadata, such as: 
      <itemizedlist>
       <listitem><para><function>mysqli_num_fields</function></para></listitem>
       <listitem><para><function>mysqli_fetch_field</function></para></listitem>
       <listitem><para><function>mysqli_fetch_field_direct</function></para></listitem>
       <listitem><para><function>mysqli_fetch_fields</function></para></listitem>
       <listitem><para><function>mysqli_field_count</function></para></listitem>
       <listitem><para><function>mysqli_field_seek</function></para></listitem>
       <listitem><para><function>mysqli_field_tell</function></para></listitem>
       <listitem><para><function>mysqli_free_result</function></para></listitem>
      </itemizedlist>
     </para>
    </note>
    <para>
     The result set structure should be freed when you are done with it, 
     which you can do by passing it to <function>mysqli_free_result</function>
    </para>
    <note>
     <para>
      The result set returned by <function>mysqli_stmt_result_metadata</function> contains only 
      metadata. It does not contain any row results. The rows are obtained by using the
      statement handle with <function>mysqli_fetch</function>.
     </para> 
    </note>
   </refsect1>
   <refsect1>
    &reftitle.returnvalues;
    <para>
     <function>mysqli_stmt_result_metadata</function> returns a result object or &false; if
     an error occured.
    </para>
   </refsect1>
   <refsect1>
    <title>See also:</title> 
    <para>
     <function>mysqli_prepare</function>,
     <function>mysqli_free_result</function>
    </para>
   </refsect1>
   <refsect1>
    <title>Example</title>
    <para>
     <example>
      <title>Object oriented style</title>
      <programlisting role='php'>
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

$mysqli->query("DROP TABLE IF EXISTS friends"); 
$mysqli->query("CREATE TABLE friends (id int, name varchar(20))"); 
 
$mysqli->query("INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

$stmt = $mysqli->prepare("SELECT id, name FROM friends");
$stmt->execute();

/* get resultset for metadata */
$result = $stmt->result_metadata();

/* retrieve field information from metadata result set */
$field = $result->fetch_field();

printf("Fieldname: %s\n", $field->name);

/* close resultset */
$result->close();

/* close connection */
$mysqli->close();
?>
]]>
      </programlisting>
     </example>
     <example>
      <title>Procedural style</title>
      <programlisting role='php'>
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");

mysqli_query($link, "DROP TABLE IF EXISTS friends"); 
mysqli_query($link, "CREATE TABLE friends (id int, name varchar(20))"); 
 
mysqli_query($link, "INSERT INTO friends VALUES (1,'Hartmut'), (2, 'Ulf')");

$stmt = mysqli_prepare($link, "SELECT id, name FROM friends");
mysqli_stmt_execute($stmt);

/* get resultset for metadata */
$result = mysqli_stmt_result_metadata($stmt);

/* retrieve field information from metadata result set */
$field = mysqli_fetch_field($result);

printf("Fieldname: %s\n", $field->name);

/* close resultset */
mysqli_free_result($result);

/* close connection */
mysqli_close($link);
?>
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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