php-doc-en/reference/mysqli/functions/mysqli-num-fields.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.4 $ -->
  <refentry id="function.mysqli-num-fields">
   <refnamediv>
    <refname>mysqli_num_fields</refname>
    <refname>result->field_count</refname>
    <refpurpose>
     Get the number of fields in a result
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <para>Procedural style:</para>
     <methodsynopsis>
      <type>int</type><methodname>mysqli_num_fields</methodname>
      <methodparam><type>object</type><parameter>result</parameter></methodparam>
     </methodsynopsis>
     <para>Object oriented style (property):</para>
     <classsynopsis>
      <ooclass><classname>result</classname></ooclass>
       <fieldsynopsis><type>int</type><varname>field_count</varname></fieldsynopsis>
     </classsynopsis>
     <para>
      <function>mysqli_num_fields</function> returns the number of fields from specified result set.
     </para>
   </refsect1>
   <refsect1>
    &reftitle.returnvalues;
    <para>The number of fields from a result set</para>
   </refsect1>
   <refsect1>
    &reftitle.seealso;
    <para>
     <function>mysqli_fetch_field</function>
    </para>
   </refsect1>
   <refsect1>
    <title>Example</title>
    <example>
     <title>Object oriented style</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();
}

if ($result = $mysqli->query("SELECT * FROM City ORDER BY ID LIMIT 1")) {

    /* determine number of fields in result set */
    $field_cnt = $result->field_count;

    printf("Result set has %d fields.\n", $field_cnt);

    /* close result set */
    $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", "world");

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

if ($result = mysqli_query($link, "SELECT * FROM City ORDER BY ID LIMIT 1")) {

    /* determine number of fields in result set */
    $field_cnt = mysqli_num_fields($result);

    printf("Result set has %d fields.\n", $field_cnt);

    /* close result set */
    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);
?>
]]>
     </programlisting>
    </example>
    <para>
     The above examples would produce the following output:
    </para>
    <screen>
<![CDATA[
Result set has 5 fields.
]]>
    </screen>
   </refsect1>
  </refentry>

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