Description
string
exif_thumbnail ( string filename [, int &width [, int &height [, int &imagetype]]])
exif_thumbnail() reads the embedded thumbnail of
a TIFF or JPEG image. If the image contains no thumbnail FALSE
will be returned.
The parameters width, height and
imagetype are available since PHP 4.3 and return the size
of the thumbnail as well as its type. It is possible that
exif_thumbnail() cannot create an image but determine its
size. In this case the return value is FALSE but width and
height are set.
If you want to deliver thumbnails through this function you should send the
mimetype information using header() function. The following
example demonstrates this:
Příklad 1. exif_thumbnail() 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";
}
?> |
|
Starting from version PHP 4.3 the function exif_thumbnail() can
return thumbnails in TIFF format.
Poznámka:
This function is only available in PHP 4 compiled using
--enable-exif.
Its functionality and behaviour has changed in PHP 4.2
This function does not require the GD image library.
See also exif_read_data() and image_type_to_mime_type().
exif_read_data
