how to take javascript array values in php form

Hello everyone i have a script which is dynamically adding textboxes correspond to the value i select in the combo/select box, but the problem is how i take that value to my php form so that i can insert that value into my database.
Here is the script:

// JavaScript Document to add dynamic text boxes onto the registration form
    $(document).ready(function(){
        $counter = 0; // initialize 0 for limitting textboxes
        $('#buttonadd').click(function(){
            if ($counter < 10)
            {
                $counter++;
                $('#buttondiv').append('<div><label>'+$counter+' Roommate Name:</label><input type="text" name="textbox[]" class="textbox" value="" /></div>');
            }else{
                alert('You cannot add more than 10 textboxes');
            }
        });

$('#buttonremove').click(function(){
            if ($counter){
                $counter--;
                $('#buttondiv .textbox:last').parent().remove(); // get the last textbox and parent for deleting the whole div
            }else{
                alert('No More textbox to remove');
            }
        });

$('#buttonget').click(function(){
            alert($('.textbox').serialize()); // use serialize to get the value of textbox
        });

$('#dropdownadd').change(function(){
            $('#dropdowndiv').html(""); // when the dropdown change set the div to empty
            $loopcount = $(this).val(); // get the selected value
            for (var i = 1; i <= $loopcount; i++)
            {
                $('#dropdowndiv').append('<div><label>'+i+' Roommate Name:</label><input type="text" name="textbox[]" class="textbox2" value="" /></div>');
            }
        });
    });

Here i am calling this into my form:

i want to insert text boxes values into my database, can anyone tell me how can i do this??