Salve,
utilizzo questo script per caricare 2 immagini:

Codice PHP:
if(isset($_FILES['1']['name'])  && $_FILES['1']['name']!=NULL){
                    $estensione = substr($_FILES['1']['name'],-4);
                    $target_path = $target_path . basename( md5($_FILES['1']['name'].date('H:m:s-d/m/Y')).stristr($estensione,'.') ); 
                    $Foto1 = md5($_FILES['1']['name'].date('H:m:s-d/m/Y')).stristr($estensione,'.');
                    if(move_uploaded_file($_FILES['1']['tmp_name'], $target_path)) {
                        echo "La foto ".  basename( md5($_FILES['1']['name'].date('H:m:s-d/m/Y')).stristr($estensione,'.') )." è stata caricata.
";
                    } else{echo "Si è verificato un problema durante l'upload della foto.";}
                } else {
                    $query = $this->db->get_where('prodotti', array('idProdotto' => $this->uri->segment(3)));
                    foreach ($query->result() as $row){
                        echo '> Foto 1 vuota!
';
                        $Foto1=$query[0]->Foto1;
                    }
                }
if(isset($_FILES['2']['name'])  && $_FILES['2']['name']!=NULL){
                    $estensione = substr($_FILES['2']['name'],-4);
                    $target_path = $target_path . basename( md5($_FILES['1']['name'].date('H:m:s-d/m/Y')).stristr($estensione,'.') ); 
                    $Foto2 = md5($_FILES['2']['name'].date('H:m:s-d/m/Y')).stristr($estensione,'.');
                    if(move_uploaded_file($_FILES['2']['tmp_name'], $target_path)) {
                        echo "La foto ".  basename( md5($_FILES['2']['name'].date('H:m:s-d/m/Y')).stristr($estensione,'.') )." è stata caricata.
";
                    } else{echo "Si è verificato un problema durante l'upload della foto.";}
                } else {
                    $query = $this->db->get_where('prodotti', array('idProdotto' => $this->uri->segment(3)));
                    foreach ($query->result() as $row){
                        echo '> Foto 2 vuota!
';
                        $Foto2=$query[0]->Foto2;
                    }
                } 
Lo script mi carica SOLO il primo file!!! Aiutatemi :S