exif_thumbnail (PHP 4 >= 4.2.0) exif_thumbnail -- Retrieve the embedded thumbnail of a TIFF or JPEG image Descriptionstring 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 4.3.0 and return the size of the thumbnail as well
as its type. It is possible that exif_thumbnail()
cannot create an image but can 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 the header() function.
The following example demonstrates this:
Beispiel 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";
}
?>
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Starting from version PHP 4.3.0, the function
exif_thumbnail() can return thumbnails in
TIFF format.
Anmerkung:
This function is only available in PHP 4 compiled using
--enable-exif.
Its functionality and behaviour has changed in PHP 4.2.0
Anmerkung:
This function does not require the GD image library.
See also exif_read_data() and
image_type_to_mime_type().
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