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<refentry id="function.mysql-num-fields">
 <refnamediv>
  <refname>mysql_num_fields</refname>
  <refpurpose>Get number of fields in result</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>mysql_num_fields</methodname>
   <methodparam><type>resource</type><parameter>result</parameter></methodparam>
  </methodsynopsis>
  <para>
   Retrieves the number of fields from a query.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysql.result.description;
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the number of fields in the result set <type>resource</type> on
   success, or &false; on failure.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>mysql_num_fields</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
    echo 'Could not run query: ' . mysql_error();
    exit;
}

/* returns 2 because id,email === two fields */
echo mysql_num_fields($result);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    &info.deprecated.alias;
    <function>mysql_numfields</function>
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mysql_select_db</function></member>
    <member><function>mysql_query</function></member>
    <member><function>mysql_fetch_field</function></member>
    <member><function>mysql_num_rows</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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