php-doc-en/reference/mysqli/mysqli_result/field-seek.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="mysqli-result.field-seek" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysqli_result::field_seek</refname>
  <refname>mysqli_field_seek</refname>
  <refpurpose>Set result pointer to a specified field offset</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.oop;</para>
  <methodsynopsis role="oop">
   <modifier>public</modifier> <type>bool</type><methodname>mysqli_result::field_seek</methodname>
   <methodparam><type>int</type><parameter>fieldnr</parameter></methodparam>
  </methodsynopsis>
  <para>&style.procedural;</para>
  <methodsynopsis>
   <type>bool</type><methodname>mysqli_field_seek</methodname>
   <methodparam><type>mysqli_result</type><parameter>result</parameter></methodparam>
   <methodparam><type>int</type><parameter>fieldnr</parameter></methodparam>
  </methodsynopsis>
  <para>
   Sets the field cursor to the given offset. The next call to 
   <function>mysqli_fetch_field</function> will retrieve the field definition
   of the column associated with that offset.
  </para>
  <note>
   <para>
    To seek to the beginning of a row, pass an offset value of zero.
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysqli.result.description;
    <varlistentry>
     <term><parameter>fieldnr</parameter></term>
     <listitem>
      <para>
       The field number. This value must be in the range from 
       <literal>0</literal> to <literal>number of fields - 1</literal>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title>&style.oop;</title>
   <programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";

if ($result = $mysqli->query($query)) {

    /* Get field information for 2nd column */
    $result->field_seek(1);
    $finfo = $result->fetch_field();

    printf("Name:     %s\n", $finfo->name);
    printf("Table:    %s\n", $finfo->table);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags:    %d\n", $finfo->flags);
    printf("Type:     %d\n\n", $finfo->type);

    $result->close();
}

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

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";

if ($result = mysqli_query($link, $query)) {

    /* Get field information for 2nd column */
    mysqli_field_seek($result, 1);
    $finfo = mysqli_fetch_field($result);

    printf("Name:     %s\n", $finfo->name);
    printf("Table:    %s\n", $finfo->table);
    printf("max. Len: %d\n", $finfo->max_length);
    printf("Flags:    %d\n", $finfo->flags);
    printf("Type:     %d\n\n", $finfo->type);

    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);
?>
]]>
   </programlisting>
   &examples.outputs;
   <screen>
<![CDATA[
Name:     SurfaceArea
Table:    Country
max. Len: 10
Flags:    32769
Type:     4

]]>
   </screen>
  </example>
 </refsect1>

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

</refentry>

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