Næste funktion til array (Billeder)

Du kan prøve kigge på prev() og next().

Jeg har kigget på de to funktioner men må indrømme at jeg er kørt lidt død i det, eftersom den selv skal finde ud af hvor current() er.

Dette er min kode pt.:
$db_tmp->execute_query("SELECT * FROM gallery_pics WHERE gallery_id = '$org[gallery_id]'");
while ($test = $db_tmp->fetchRow(3)) {
    $array[] = $test['id'];
}
for ($counter = 0; $array[$counter] != $org['id']; $counter++) {
}
echo"Current: $array[$counter]<br>";
$next = $counter++;
$prev = $counter--;
echo"Next: $array[$next]<br>
Prev: $array[$prev]<br>";
   
print_r($array);

Den outputter dog underligt.
Hvis $id er lig med 4 siger den:
Current: 4
Next: 4
Prev: 6
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 6 )

Id=1:
Current: 1
Next: 1
Prev: 2
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 6 )

Løste det med:
    $db->execute_query("SELECT * FROM gallery_pics WHERE id = '$_GET[id]'");
    $org = $db->fetchRow(3);
   
    $db_tmp->execute_query("SELECT * FROM gallery_pics WHERE gallery_id = '$org[gallery_id]'");
    while ($test = $db_tmp->fetchRow(3)) {
        $array[] = $test['id'];
    }

    for ($counter = 0; $array[$counter] != $org['id']; $counter++) {
    }
    echo"Current: $array[$counter]<br>";
    $db_tmp->execute_query('SELECT id FROM gallery_pics WHERE gallery_id='.$org['gallery_id'].' AND id<'.$_GET['id'].' ORDER BY id DESC LIMIT 1');
    $db_tmp_row=$db_tmp->fetchRow(3);
    $prev=$db_tmp_row[id];
   
    $db_tmp->execute_query('SELECT id FROM gallery_pics WHERE gallery_id='.$org['gallery_id'].' AND id>'.$_GET['id'].' ORDER BY id ASC LIMIT 1');
    $db_tmp_row=$db_tmp->fetchRow(3);
    $next=$db_tmp_row[id];
   
    echo"Next: $next<br>
    Prev: $prev<br>";