php-doc-en/reference/pgsql/functions/pg-field-name.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry xml:id="function.pg-field-name" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_field_name</refname>
  <refpurpose>Returns the name of a field</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>pg_field_name</methodname>
   <methodparam><type>resource</type><parameter>result</parameter></methodparam>
   <methodparam><type>int</type><parameter>field_number</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_field_name</function> returns the name of the field
   occupying the given <parameter>field_number</parameter> in the
   given PostgreSQL <parameter>result</parameter> resource.  Field
   numbering starts from 0.
  </para>
  <note>
   <para>
    This function used to be called <function>pg_fieldname</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>
    <varlistentry>
     <term><parameter>field_number</parameter></term>
      <listitem>
       <para>
        Field number, starting from 0.
       </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The field name, or &false; on error.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Getting information about fields</title>
    <programlisting role="php">
<![CDATA[
<?php
  $dbconn = pg_connect("dbname=publisher") or die("Could not connect");

  $res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
  $i = pg_num_fields($res);
  for ($j = 0; $j < $i; $j++) {
      echo "column $j\n";
      $fieldname = pg_field_name($res, $j);
      echo "fieldname: $fieldname\n";
      echo "printed length: " . pg_field_prtlen($res, $fieldname) . " characters\n";
      echo "storage length: " . pg_field_size($res, $j) . " bytes\n";
      echo "field type: " . pg_field_type($res, $j) . " \n\n";
  }
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
column 0
fieldname: author
printed length: 6 characters
storage length: -1 bytes
field type: varchar 

column 1
fieldname: year
printed length: 4 characters
storage length: 2 bytes
field type: int2 

column 2
fieldname: title
printed length: 24 characters
storage length: -1 bytes
field type: varchar 
]]>
    </screen>
   </example> 
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_field_num</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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