WordPress stores when uploading files, some data in the meta data - the metadata. If there are pictures involved and these files contain EXIF data, then it outputs some EXIF data which can be used. For example, as additional information about the picture in a photo blog.

No matter what, and how you want to do that, here is a small function that reads the Exif data.

The second function fb_simple_exif() is for the direct output and uses the first function, which gives the values back to use.

// grab exif data from wp attachment
function grab_exif_data_from_wp($post_ID, $debug = FALSE) {
	global $id, $post;
	
	if ( !isset($post_ID) || '' == $post_ID )
		return FALSE;
	
	$meta = wp_get_attachment_metadata($post_ID, FALSE);
	
	$return = '';
	
	if ( $meta['image_meta']['created_timestamp'] )
		$return .= date( "d-M-Y H:i:s", $meta['image_meta']['created_timestamp'] );
	if ( $meta['image_meta']['copyright'] )
		$return .= $meta['image_meta']['copyright'];
	if ( $meta['image_meta']['credit'] )
		$return .= $meta['image_meta']['credit'];
	if ( $meta['image_meta']['title'] )
		$return .= $meta['image_meta']['title'];
	if ( $meta['image_meta']['caption'] )
		$return .= $meta['image_meta']['caption'];
	if ( $meta['image_meta']['camera'] )
		$return .= $meta['image_meta']['camera'];
	if ( $meta['image_meta']['focal_length'] )
		$return .= __( '· Brennweite:', FB_GREYFOTO_TEXTDOMAIN )
		           . ' ' . $meta['image_meta']['focal_length'] 
		           . __( 'mm', FB_GREYFOTO_TEXTDOMAIN );
	if ( $meta['image_meta']['aperture'] )
		$return .= $meta['image_meta']['aperture'];
	if ( $meta['image_meta']['iso'] )
		$return .= $meta['image_meta']['iso'];
	if ( $meta['image_meta']['shutter_speed'] )
		$return .= number_format($meta['image_meta']['shutter_speed'], 2) . ' ' . __( 'seconds', FB_GREYFOTO_TEXTDOMAIN );
	
	if ($debug) {
		ob_start();
		var_dump($meta);
		$return = ob_get_clean();
	}
	
	return $return;
}

function fb_simple_exif($post_ID, $debug) {
	
	$echo = grab_exif_data_from_wp($post_ID, $debug);
	
	if ( $echo && '' != $echo )
		echo $echo;
}