php-doc-en/reference/exif/functions/exif-thumbnail.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/image.xml, last change in rev 1.78 -->
<refentry xml:id="function.exif-thumbnail" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>exif_thumbnail</refname>
  <refpurpose>Retrieve the embedded thumbnail of a TIFF or JPEG image</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>exif_thumbnail</methodname>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter role="reference">width</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter role="reference">height</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter role="reference">imagetype</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>exif_thumbnail</function> reads the embedded thumbnail of a 
   <acronym>TIFF</acronym> or <acronym>JPEG</acronym> image. 
  </para>
  <para>
   If you want to deliver thumbnails through this function, you should send
   the mimetype information using the <function>header</function> function.
  </para>
  <para>
   It is possible that <function>exif_thumbnail</function> cannot create an 
   image but can determine its size. In this case, the return value is 
   &false; but <parameter>width</parameter> and <parameter>height</parameter> 
   are set.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       The name of the image file being read.  This image contains an
       embedded thumbnail.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>width</parameter></term>
     <listitem>
      <para>
       The return width of the returned thumbnail.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>height</parameter></term>
     <listitem>
      <para>
       The returned height of the returned thumbnail.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>imagetype</parameter></term>
     <listitem>
      <para>
       The returned image type of the returned thumbnail.  This is either
       <acronym>TIFF</acronym> or <acronym>JPEG</acronym>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the embedded thumbnail, or &false; if the image contains no 
   thumbnail.
  </para>
 </refsect1>
 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>4.3.0</entry>
       <entry>
        The optional parameters <parameter>width</parameter>, 
        <parameter>height</parameter>, and <parameter>imagetype</parameter> 
        all became available.
       </entry>
      </row>
      <row>
       <entry>4.3.0</entry>
       <entry>
        May return thumbnails in the <acronym>TIFF</acronym> format.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>exif_thumbnail</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
if (array_key_exists('file', $_REQUEST)) {
    $image = exif_thumbnail($_REQUEST['file'], $width, $height, $type);
} else {
    $image = false;
}
if ($image!==false) {
    header('Content-type: ' .image_type_to_mime_type($type));
    echo $image;
    exit;
} else {
    // no thumbnail available, handle the error here
    echo 'No thumbnail available';
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>exif_read_data</function></member>
    <member><function>image_type_to_mime_type</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->