Ndtyjky

function zwrot() {

   var zwrot = document.getElementsByClassName("zwroc");

   var i;

   for (i = 0; i < zwrot.length; i++) {

      if(zwrot[i].checked){

        parseInt(zwrot[i])

        var ajax = $.ajax({

            url: 'php/request.php',

            type: 'POST',

            data: {zwrot: zwrot[i].value},

            success: function(data)

            {

               $.growl.notice({ 

                    title: "INFO", 

                    message: "Oddano książkę" });

            }

        })

      }

   }

   setTimeout(function() { 

                  location.reload()

              }, 2000

   );

}

php code:

if(isset($_POST['zwrot'])) { 

      $zwrot=$_POST['zwrot']; 

      $n = count($zwrot); 

      for ($i=0;$i<$n; $i++){ 

           $data=date("d-m-Y"); 

           $zapytanie5 = mysqli_query ($link, "UPDATE zamowienie SET data_zwrotu='$data' WHERE id_zamowienie=$zwrot[$i]"); 

           $zapytanie6 = mysqli_query ($link, "UPDATE ksiazka INNER JOIN zamowienie ON ksiazka.id_ksiazka=zamowienie.id_ksiazka SET ilosc=ilosc+1 WHERE id_zamowienie=$zwrot[$i];");

      }

}

everything is ok, until id is a one-digit number. the problem occurs with two-digit numbers, php sees, for example, 11 as 1

I dont think you're passing any array to your php. and that's not how you pass and receive an array through ajax if ever, you need json for that.

Anyway, try this:

if(isset($_POST['zwrot'])) { 



    $zwrot=$_POST['zwrot']; 



    $data=date("d-m-Y"); 

    $zapytanie5 = mysqli_query ($link, "UPDATE zamowienie SET data_zwrotu='$data' WHERE id_zamowienie=$zwrot"); 

    $zapytanie6 = mysqli_query ($link, "UPDATE ksiazka INNER JOIN zamowienie ON ksiazka.id_ksiazka=zamowienie.id_ksiazka SET ilosc=ilosc+1 WHERE id_zamowienie=$zwrot;");



}

Or if you want to pass by array:

function zwrot() {

   var zwrot = document.getElementsByClassName("zwroc");

   var i;



   var zwrot_array = ;



   for (i = 0; i < zwrot.length; i++) {

      if(zwrot[i].checked){

        zwrot_array[i] = zwrot[i].value;

      }

   }



   var ajax = $.ajax({

        url: 'php/request.php',

        type: 'POST',

        data: {zwrot: JSON.stringify(zwrot_array)},

        success: function(data)

        {

           $.growl.notice({ 

                title: "INFO", 

                message: "Oddano książkę" 

            });



            setTimeout(function() { 

                  location.reload()

              }, 2000

           );

        }

    });

}

PHP:

if(isset($_POST['zwrot'])) { 



    $zwrots = json_decode($_POST['zwrot']); 

    $data=date("d-m-Y"); 



    foreach ($zwrots as $zwrot) {

        $zapytanie5 = mysqli_query ($link, "UPDATE zamowienie SET data_zwrotu='$data' WHERE id_zamowienie=$zwrot"); 

        $zapytanie6 = mysqli_query ($link, "UPDATE ksiazka INNER JOIN zamowienie ON ksiazka.id_ksiazka=zamowienie.id_ksiazka SET ilosc=ilosc+1 WHERE id_zamowienie=$zwrot;");

    }

}