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

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
  <refentry id="function.mysqli-fetch-fields">
   <refnamediv>
    <refname>mysqli_fetch_fields</refname>
    <refname>result->fetch_fields</refname>
    <refpurpose>Returns an array of objects representing the fields in a result set</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <para>Procedural Style:</para>
     <methodsynopsis>
      <type>mixed</type><methodname>mysqli_fetch_fields</methodname>
      <methodparam><type>object</type><parameter>result</parameter></methodparam>
     </methodsynopsis>
     <para>Object oriented style (method):</para>
     <classsynopsis>
      <ooclass><classname>result</classname></ooclass>
      <methodsynopsis>
       <type>mixed</type>
       <methodname>fetch_fields</methodname>
       <void/>
      </methodsynopsis>
     </classsynopsis>
    <para>
     This function serves an identical purpose to the <function>mysqli_fetch_field</function>
     function with the single difference that, instead of returning one object at a time for
     each field, the columns are returned as an array of objects. 
    </para>
   </refsect1>
   <refsect1>
    <title>Return values</title>
    <para>
     Returns an array of objects which contains field definition informations or &false; if no field information
     is available.
    </para>
    <para>
    <table>
     <title>Object properties</title>
     <tgroup cols='2'>
      <thead>
       <row>
        <entry>Property</entry>
        <entry>Description</entry>
       </row>
      </thead>
      <tbody>
       <row>
        <entry>name</entry>
        <entry>The name of the column</entry>
       </row>
       <row>
        <entry>orgname</entry>
        <entry>Original column name if an alias was specified</entry>
       </row>
       <row>
        <entry>table</entry>
        <entry>The name of the table this field belongs to (if not calculated)</entry>
       </row>
       <row>
        <entry>orgtable</entry>
        <entry>Original table name if an alias was specified</entry>
       </row>
       <row>
        <entry>def</entry>
        <entry>The default value for this field, represented as a string</entry>
       </row>
       <row>       
        <entry>max_length</entry>
        <entry>The maximum width of the field for the result set.</entry>
       </row>
       <row>
        <entry>flags</entry>
        <entry>An integer representing the bit-flags for the field.</entry>
       </row>
       <row>
        <entry>type</entry>
        <entry>The data type used for this field</entry>
       </row>
       <row>
        <entry>decimals</entry>
        <entry>The number of decimals used (for integer fields)</entry>
       </row>
      </tbody>
     </tgroup>
    </table>
    </para>
   </refsect1>
   <refsect1>
    <title>See also</title>
    <para>
     <function>mysqli_num_fields</function>
     <function>mysqli_fetch_field</function>
     <function>mysqli_fetch_field_direct</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();
}

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

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

    /* Get field information for all columns */
    $finfo = $result->fetch_fields();

    for ($i=0; $i < count($finfo); $i++) { 
        printf("Name:     %s\n", $finfo[$i]->name);
        printf("Table:    %s\n", $finfo[$i]->table);
        printf("max. Len: %d\n", $finfo[$i]->max_length);
        printf("Flags:    %d\n", $finfo[$i]->flags);
        printf("Type:     %d\n\n", $finfo[$i]->type);
    }    
    $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();
}

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

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

    /* Get field information for all columns */
    $finfo = mysqli_fetch_fields($result);
 
    for ($i=0; $i < count($finfo); $i++) { 
        printf("Name:     %s\n", $finfo[$i]->name);
        printf("Table:    %s\n", $finfo[$i]->table);
        printf("max. Len: %d\n", $finfo[$i]->max_length);
        printf("Flags:    %d\n", $finfo[$i]->flags);
        printf("Type:     %d\n\n", $finfo[$i]->type);
    }    
    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);
?>
]]>
     </programlisting>
    </example>
    <para>
     The above examples would produce the following output:
    </para>
    <screen>
<![CDATA[
Name:     Name
Table:    Country
max. Len: 11
Flags:    1
Type:     254

Name:     SurfaceArea
Table:    Country
max. Len: 10
Flags:    32769
Type:     4

]]>
    </screen>
   </refsect1>
  </refentry>

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