php current array position and previous/next - php

Question

I have read through many posts regarding previous/next and I am still very much stuck.
I have a page which shows an image and related data. This is obtained from a database. The images are located within the website folder in folders per album. So an image folder may contain 1, 2 or 100 images.
I have a function as follows for this data:-
function get_images_album($artist_id) {
$artist_id = (int)$artist_id;
$images = array();
$image_query = mysql_query("SELECT `image_album_id`, `member_id`, `artist_id`,
`albumname`, `ext`, `timestamp` FROM `album_images`
WHERE `artist_id`=$artist_id AND `member_id`=".$_SESSION['member_id']);
while ($images_row = mysql_fetch_assoc($image_query)) {
$images[] = array(
'id' => $images_row['image_album_id'],
'album' => $images_row['artist_id'],
'albumname' => $images_row['albumname'],
'ext' => $images_row['ext'],
'timestamp' => $images_row['timestamp']
);
}
return $images;
}
The page shows the correct image and data per the url on localhost. Site/album_view.php?artist_id=4&image_album_id=4.
On the html page the code is:-
$images = get_images_album($artist_id);
if (empty($images)) {
echo 'There are no Images in this album.';
}else{
foreach ($images as $key => $val) {
}
}
?>
I had understood that if I echo $key and current($val) I would get the array index nos. and image id for the current page. In the case above this would be 0 and 4. However I always get the last index details of the array, which happens to be 13 and 2181 for the particular album.
I know all the data is there as I have echoed the array and all seems ok.
I do not know why.
Going on from what I have I cannot work out how to proceed to get the next and previous settings Thank you.

Answer 1

An easier way to go about this might be to change your get_images_album function slightly:
function get_images_album($artist_id) {
$artist_id = (int)$artist_id;
$images = array();
$image_query = mysql_query("SELECT `image_album_id`, `member_id`, `artist_id`,
`albumname`, `ext`, `timestamp` FROM `album_images`
WHERE `artist_id`=$artist_id AND `member_id`=".$_SESSION['member_id']);
While ($images_row = mysql_fetch_assoc($image_query)) {
// $images[] = array(
// instead, make your images array a hash and key it on the album_id
$images[$images_row["image_album_id"]] = array(
'id' => $images_row['image_album_id'],
'album' => $images_row['artist_id'],
'albumname' => $images_row['albumname'],
'ext' => $images_row['ext'],
'timestamp' => $images_row['timestamp']
);
}
return $images;
}
now you can eliminate your foreach loop and just get the album you're looking for:
$images = get_images_album($artist_id);
if (empty($images)) {
echo 'There are no Images in this album.';
}else{
$album_images = $images[$image_album_id];
// do stuff with the $album_images hash
var_dump($album_images);
}