ای جکس درون یک حلقه

foreach($OnIsbn as $key => $value)
{
$query = "select title,price from books where isbn=$value";
$result = @mysql_query ($query);
$row = mysql_fetch_assoc($result);
echo '<tr>';
echo '<td>'.$row['title'].'</td>';
echo '<td class = cost>'.$row['price'].'</td>';
echo '<td><input class = num type = text size = 5 value = 1 ></td>';
echo '<td><p id = total></p></td>';
echo '<td><button data-id = class = button-row></button></td>';
echo '</tr>';
}


$(document).ready(function(){
$(".num").keyup(function(){
var count_book = $(".num").val();
var price_book = $(".cost").text();
$.ajax({
type:'post',
url: 'calcute.php',
data:'count_book=' + count_book + '&' + 'price_book=' + price_book,
success: function(data)
{
$("#total").html(data);
}
});
});

});


<?php
$count_book = $_POST['count_book'];
$price_book = $_POST['price_book'];
function times($number , $price)
{
retu $number * $price ;
}
echo times($count_book, $price_book);
?>