<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.pg-num-fields" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_num_fields</refname> 
  <refpurpose>Returns the number of fields in a result</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>pg_num_fields</methodname>
   <methodparam><type>resource</type><parameter>result</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_num_fields</function> returns the number of fields
   (columns) in a PostgreSQL result resource.
  </para>
  <note>
   <para>
    This function used to be called <function>pg_numfields</function>.
   </para>
  </note>
 </refsect1>

<refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>result</parameter></term>
     <listitem>
      <para>
       PostgreSQL query result resource, returned by <function>pg_query</function>,
       <function>pg_query_params</function> or <function>pg_execute</function>
       (among others).
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The number of fields (columns) in the result. On error, -1 is returned.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_num_fields</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$result = pg_query($conn, "SELECT 1, 2");

$num = pg_num_fields($result);

echo $num . " field(s) returned.\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
2 field(s) returned.
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_num_rows</function></member>
    <member><function>pg_affected_rows</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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