My form doesn't submit information in input text - php

Question

I'm doing a table where the user can introduce the number of the products he want to buy and submit them pressing the submission button. I build the content of the table using a sql query (SELECT) setting the name of the input(text) like in the code below. My problem is that, probably, the form doesn't submit nothing because, if a check the variable $_REQUEST with isset(), it return FALSE. Someone can help me? Thanks!
$con=mysqli_connect("localhost","uPower","","info");
if (mysqli_connect_errno())
printf("<p>Error!!: %s<p>\n", mysqli_connect_error());
else{
$query = "SELECT * FROM product";
$result = mysqli_query ($con, $query);
echo "<form name=\"buy\" action=\"confirm.php\" method=\"POST\" onSubmit=\"return checkInputQty(qty.value) \">";
echo"<table>";
echo"<tr><th>Product name</th><th>Price</th><th>Available</th><th>Qty</th></tr>";
while ($row = mysqli_fetch_assoc($result)){
$pid = $row["pid"];
$name = $row["name"];
$qty = $row["qty"];
$price = ($row['price'])/100;
echo"<tr><th>$name</th><th>".number_format($price,2,',', '')." &#8364</th><th>$qty</th><th><input type=\"text\" id=".$pid." name=".$name."></th></tr>";
}
echo"</table>";
echo "<p><input type=\"submit\" value=\"BUY\" class=\"button\" ><input type=\"button\" onclick=\"clearText()\" value=\"DELETE\" class=\"button\"></p>";
echo "</form>";
mysqli_free_result($result);
mysqli_close($con);
there is the part of confirm.php. It is a function in head that i called from the body of the page. It does a summary of what the user selected to buy. The control with if(isset($_REQUEST)) is false, so the page is blank....
<?php
function checkInputQty(){
$con=mysqli_connect("localhost","uPower","","info");
if (mysqli_connect_errno())
echo "error DB";
else{
$query = "SELECT * FROM product";
$result = mysqli_query ($con, $query);
while($row = mysqli_fetch_assoc($result)){
$nome = $row["name"];
if(isset($_REQUEST["$name"])){
$qty = trim($_REQUEST['$row["name"]']);
if($qty>0 && $qty<=$row["qty"]){
$new_qty = $row["qty"]-$qty;
$query2 = "UPDATE product SET qty = '$new_qty' WHERE qty = '".$row["qty"]."' ";
$result2 = mysqli_query ($con, $query2);
if($result){
echo "<table>";
echo "<tr><th>Name</th><th></th><th>Price</th></tr>";
do_content($row["name"],$qty,$row["price"]/100);
echo "</table>";
}
else
echo "Error!";
}
}e
}
mysqli_free_result($result);
}
mysqli_close($con);
}
?>
<?php
function do_content($name,$to_buy,$price){
echo "<tr><th>$name</th><th>$to_buy</th><th>$price</th></tr>";
}
?>