简单查询不从数据库中提取

Question

I cannot figure this out, it's not an error as such, but when i try to echo out the results of a query:

  echo "SELECT * FROM `active_customers` WHERE `cus_email`='".$k."' AND `cus_product`='".$_GET['product']."'" . "<br />";
  $q = mysql_query("SELECT * FROM `active_customers` WHERE `cus_email`='".$k."' AND `cus_product`='".$_GET['product']."'");
  $a = mysql_fetch_array($r);
  $n = mysql_num_rows($q);
  echo "Number of rows:" . $n;
  echo $a['cus_id'];
  echo $a['cus_email'];

The number of posts is returning the correct number which is 1, these values $a['cus_id']; and $a['cus_email']; are not coming through at all, i even did a mysql query in phpmyadmin and it works there.

can anyone see what i have done wrong?

Answer 1

correct code can be

echo "SELECT * FROM `active_customers` WHERE `cus_email`='".$k."' AND `cus_product`='".$_GET['product']."'" . "<br />";
$q = mysql_query("SELECT * FROM `active_customers` WHERE `cus_email`='".$k."' AND `cus_product`='".$_GET['product']."'");
$n = mysql_num_rows($q);
echo "Number of rows:" . $n;
while($row = mysql_fetch_array($q, MYSQL_ASSOC)){
  echo $row['cus_id'];
  echo $row['cus_email'];
}

Although i would recommend using mysqli or PDO for sql databases