exif_thumbnail
(PHP 4 >= 4.2.0, PHP 5)
exif_thumbnail -- Retrieve the embedded thumbnail of a TIFF or JPEG image
说明
string
exif_thumbnail ( string filename [, int &width [, int &height [, int &imagetype]]] )
exif_thumbnail() 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() function.
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.
参数
- filename
The name of the image file being read. This image contains an
embedded thumbnail.
- width
The return width of the returned thumbnail.
- height
The returned height of the returned thumbnail.
- imagetype
The returned image type of the returned thumbnail. This is either
TIFF or JPEG.
返回值
Returns the embedded thumbnail, or FALSE if the image contains no
thumbnail.
例
例子 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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