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# exif_thumbnail

(PHP 4 >= 4.2.0)

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

## 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:

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";
    }
    ?>

Starting from version PHP 4.3 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

> This function does not require the GD image library.

> See also exif_read_data() and image_type_to_mime_type().

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