[PHP-DOC] cvs: phpdoc /en/reference/image/functions exif-thumbnail.xml

[Marcus Börger]

helly           Fri Aug 16 12:43:45 2002 EDT

  Modified files:              
    /phpdoc/en/reference/image/functions        exif-thumbnail.xml 
  Log:
  example with image_type_to_mime_type
  
  
Index: phpdoc/en/reference/image/functions/exif-thumbnail.xml
diff -u phpdoc/en/reference/image/functions/exif-thumbnail.xml:1.2 
phpdoc/en/reference/image/functions/exif-thumbnail.xml:1.3
--- phpdoc/en/reference/image/functions/exif-thumbnail.xml:1.2  Wed Apr 17 02:39:09 
2002
+++ phpdoc/en/reference/image/functions/exif-thumbnail.xml      Fri Aug 16 12:43:45 
+2002
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/image.xml, last change in rev 1.78 -->
  <refentry id="function.exif-thumbnail">
   <refnamediv>
@@ -13,6 +13,7 @@
       <methodparam><type>string</type><parameter>filename</parameter></methodparam>
       <methodparam 
choice="opt"><type>int</type><parameter>&amp;width</parameter></methodparam>
       <methodparam 
choice="opt"><type>int</type><parameter>&amp;height</parameter></methodparam>
+      <methodparam 
+choice="opt"><type>int</type><parameter>&amp;imagetype</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>exif_thumbnail</function> reads the embedded thumbnail of
@@ -20,13 +21,41 @@
     will be returned.
    </para>
    <para>
-    Both parameters <parameter>width</parameter> and <parameter>height</parameter> are
-    available since PHP 4.3 and return the size of the thumbnail. It is possible that
+    The parameters <parameter>width</parameter>, <parameter>height</parameter> and
+    <parameter>imagetype</parameter> are available since PHP 4.3 and return the size 
+    of the thumbnail as well as its type. It is possible that
     <function>exif_thumbnail</function> cannot create an image but determine its
     size. In this case the return value is &false; but <parameter>width</parameter> 
and
     <parameter>height</parameter> are set.
    </para>
    <para>
+    If you want to deliver thumbnails through this function you should send the 
+    mimetype information using <function>header</function> function. The following
+    example demonstrates this:
+     <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>
+   <para>
     Starting from version PHP 4.3 the function <function>exif_thumbnail</function> can
     return thumbnails in <acronym>TIFF</acronym> format.
    </para>
@@ -41,7 +70,7 @@
       This function does not require the GD image library.
      </simpara>
      <simpara>
-      See also <function>exif_read_data</function>.
+      See also <function>exif_read_data</function> and 
+<function>image_type_to_mime_type</function>.
      </simpara>
     </note>
    </para>



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