solo un esempio per farti capire....
Codice PHP:
<form name="prova" method="post" action="form.php">
<input type="hidden" name="inviato" value="1">
<input type="checkbox" name="img[]" value="1">
<input type="checkbox" name="img[]" value="2">
<input type="checkbox" name="img[]" value="3">
<input type="checkbox" name="img[]" value="4">
<input type="checkbox" name="img[]" value="5">
<input type="checkbox" name="img[]" value="6">
<input type="checkbox" name="img[]" value="7">
<input type="submit" value="invia">
<?php
if(isset($_POST['inviato'])){
foreach($_POST['img'] AS $val){
print $val . "
";
}
}
?>