php man page for exif_thumbnail

EXIF_THUMBNAIL(3)							 1							 EXIF_THUMBNAIL(3)

exif_thumbnail - Retrieve the embedded thumbnail of a TIFF or JPEG image

SYNOPSIS
       string exif_thumbnail (string  $filename, [int  &$width], [int  &$height], [int	&$imagetype])

DESCRIPTION
       exif_thumbnail(3) reads the embedded thumbnail of a TIFF or JPEG image.

	If you want to deliver thumbnails through this function, you should send the mimetype information using the header(3) function.

	It  is	possible  that	exif_thumbnail(3)  cannot  create an image but can determine its size. In this case, the return value is FALSE but
       $width and $height are set.

PARAMETERS
	      o $filename
		- The name of the image file being read. This image contains an embedded thumbnail.

	      o $width
		- The return width of the returned thumbnail.

	      o $height
		- The returned height of the returned thumbnail.

	      o $imagetype
		- The returned image type of the returned thumbnail. This is either TIFF or JPEG.

RETURN VALUES
	Returns the embedded thumbnail, or FALSE if the image contains no thumbnail.

EXAMPLES
       Example #1

	      exif_thumbnail(3) example

	      <?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';
	      }
	      ?>

SEE ALSO
       exif_read_data(3), image_type_to_mime_type(3).

PHP Documentation Group 													 EXIF_THUMBNAIL(3)