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https://github.com/sigmasternchen/php-doc-en
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1846bab5f1
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@128940 c90b9560-bf6c-de11-be94-00142212c4b1
104 lines
3.3 KiB
XML
104 lines
3.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- splitted from ./en/functions/image.xml, last change in rev 1.78 -->
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<refentry id="function.exif-thumbnail">
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<refnamediv>
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<refname>exif_thumbnail</refname>
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<refpurpose>Retrieve the embedded thumbnail of a TIFF or JPEG image</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>string</type><methodname>exif_thumbnail</methodname>
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<methodparam><type>string</type><parameter>filename</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>&width</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>&height</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>&imagetype</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>exif_thumbnail</function> reads the embedded thumbnail of
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a TIFF or JPEG image. If the image contains no thumbnail &false;
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will be returned.
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</para>
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<para>
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The parameters <parameter>width</parameter>,
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<parameter>height</parameter> and <parameter>imagetype</parameter> are
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available since PHP 4.3.0 and return the size of the thumbnail as well
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as its type. It is possible that <function>exif_thumbnail</function>
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cannot create an image but can determine its size. In this case, the
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return value is &false; but <parameter>width</parameter> and
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<parameter>height</parameter> are set.
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</para>
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<para>
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If you want to deliver thumbnails through this function, you should send
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the mimetype information using the <function>header</function> function.
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The following example demonstrates this:
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</para>
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<para>
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<example>
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<title><function>exif_thumbnail</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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if (array_key_exists('file',$_REQUEST)) {
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$image = exif_thumbnail($_REQUEST['file'], $width, $height, $type);
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} else {
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$image = false;
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}
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if ($image!==false) {
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header("Content-type: ".image_type_to_mime_type($type));
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echo $image;
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exit;
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} else {
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// no thumbnail available, handle the error here
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echo "No thumbnail available";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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Starting from version PHP 4.3.0, the function
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<function>exif_thumbnail</function> can return thumbnails in
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<acronym>TIFF</acronym> format.
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</para>
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<note>
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<simpara>
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This function is only available in PHP 4 compiled using
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<option role="configure">--enable-exif</option>.
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Its functionality and behaviour has changed in PHP 4.2.0
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</simpara>
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</note>
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<note>
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<simpara>
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This function does not require the GD image library.
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</simpara>
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</note>
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<simpara>
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See also <function>exif_read_data</function> and
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<function>image_type_to_mime_type</function>.
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</simpara>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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