L'ho adattato cosi' per provaCodice PHP:
$imglav = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24);
$i=0;
$x=0;
$k=0;
while($k <= count($imglav)){
$i++;
$x++;
echo $imglav[$k++];
if($i==4) {
echo '
';
$i=0;
}
if($x==12) {
echo "
";
$x=0;
}
}