MySQL stored procedure method example of returning multiple values

mysql> desc orders;
+----------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------+-------------+------+-----+---------+-------+
| orderNumber | int(11) | NO | PRI | NULL | |
| orderDate | date | NO | | NULL | |
| requiredDate | date | NO | | NULL | |
| shippedDate | date | YES | | NULL | |
| status | varchar(15) | NO | | NULL | |
| comments | text | YES | | NULL | |
| customerNumber | int(11) | NO | MUL | NULL | |
+----------------+-------------+------+-----+---------+-------+
7 rows in set

DELIMITER $$
CREATE PROCEDURE get_order_by_cust(
 IN cust_no INT,
 OUT shipped INT,
 OUT canceled INT,
 OUT resolved INT,
 OUT disputed INT)
BEGIN
 -- shipped
 SELECT
      count(*) INTO shipped
    FROM
      orders
    WHERE
      customerNumber = cust_no
        AND status = 'Shipped';
 -- canceled
 SELECT
      count(*) INTO canceled
    FROM
      orders
    WHERE
      customerNumber = cust_no
        AND status = 'Canceled';
 -- resolved
 SELECT
      count(*) INTO resolved
    FROM
      orders
    WHERE
      customerNumber = cust_no
        AND status = 'Resolved';
 -- disputed
 SELECT
      count(*) INTO disputed
    FROM
      orders
    WHERE
      customerNumber = cust_no
        AND status = 'Disputed';
END

+----------+-----------+-----------+-----------+
| @shipped | @canceled | @resolved | @disputed |
+----------+-----------+-----------+-----------+
| 22 | 0 | 1 | 1 |
+----------+-----------+-----------+-----------+
1 row in set

<?php
/**
 * Call stored procedure that return multiple values
 * @param $customerNumber
 */
function call_sp($customerNumber)
{
  try {
    $pdo = new PDO("mysql:host=localhost;dbname=yiibaidb", 'root', '123456');
    // execute the stored procedure
    $sql = 'CALL get_order_by_cust(:no,@shipped,@canceled,@resolved,@disputed)';
    $stmt = $pdo->prepare($sql);
    $stmt->bindParam(':no', $customerNumber, PDO::PARAM_INT);
    $stmt->execute();
    $stmt->closeCursor();
    // execute the second query to get values ​​from OUT parameter
    $r = $pdo->query("SELECT @shipped,@canceled,@resolved,@disputed")
         ->fetch(PDO::FETCH_ASSOC);
    if ($r) {
      printf('Shipped: %d, Canceled: %d, Resolved: %d, Disputed: %d',
        $r['@shipped'],
        $r['@canceled'],
        $r['@resolved'],
        $r['@disputed']);
    }
  } catch (PDOException $pe) {
    die("Error occurred:" . $pe->getMessage());
  }
}
call_sp(141);