以下例子演示了php如何获取exif图片的缩略图。就是实现图片的自动缩略图，原先以为要，自己来修改来，其实php有函数。
完整代码：
// file to read
$file = 'test.jpg';
$image = exif_thumbnail($file, $width, $height, $type);
// width, height and type get filled with data
// after calling "exif_thumbnail"
if ($image) {
// send header and image data to the browser:
header('content-type: ' .image_type_to_mime_type($type));
print $image;
}
else {
// there is no thumbnail available, handle the error:
print 'no thumbnail available';
}
$file = 'test.jpg';
$image = exif_thumbnail($file, $width, $height, $type);
// width, height and type get filled with data
// after calling "exif_thumbnail"
if ($image) {
// send header and image data to the browser:
header('content-type: ' .image_type_to_mime_type($type));
print $image;
}
else {
// there is no thumbnail available, handle the error:
print 'no thumbnail available';
}