<form class="form-horizontal" method= "POST">
<div class="control-group">
    <div class="inc">
        <div class="controls">
            <button style="margin-left: 50px" class="btn btn-info" type="submit" id="append" name="append">
            Add Textbox</button>
            <br>
            <br>
        </div>
    </div>
    <input type="submit" class="btn btn-info" name="submit" value="submit"/>
</div>
<?php
$host = "localhost";
$dbname = "lala";
$user = "root";
$pass = "";
$conn = new PDO("mysql:host=$host; dbname=$dbname", $user, $pass);
if (isset($_POST['submit'])) {


    $color = $_POST['color'];
    $price = $_POST['price'];
    $size = $_POST['size'];
    $quantity = $_POST['quantity'];
    foreach ($color as $colors ) {
                foreach ($price as $prices ) {
                    foreach ($size as $sizes ) {
                        foreach ($quantity as $quantities ) {
        $sql = "INSERT into sasa (color,price,size,quantity) values('$colors','$prices','$sizes','$quantities)";
        echo $sql . "<br>";
        $q = $conn->query($sql);
    }
    }
    }
       }

}

?>

<script type="text/javascript">
                    $(document).ready(function () {

$("#append").click(function (e) {
    e.preventDefault();
    var textboxes = $(".textbox").length;
    if (textboxes < 5) {
        $(".inc").append("<div class='controls'><input class='textbox form-control' type='text' name='color[]'><input class='textbox form-control' type='text' name='price[]' ><input class='textbox form-control' type='text' name='size[]'><input class='textbox form-control' type='text' name='quantity[]'><a href='#' class='remove_this btn btn-danger'>remove</a> </div>");
    }
});

$(document).on('click', '.remove_this', function (e) {
    e.preventDefault();
    $(this).parent().remove();
});