PHP, how to call a stored procedure with an OUT variable

If I had a stored procedure like this:

DROP PROCEDURE IF EXISTS getCustomer;
DELIMITER //
CREATE PROCEDURE getCustomer(cid int, OUT name varchar(255))
BEGIN
	SELECT firstname INTO name
    FROM customers 
	WHERE custid = cid;
END //
DELIMITER ;

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How do I get that value of that OUT variable?

My current incorrect code is:

$value = 7;
    $sql = "call getCustomer(?);";
    $stmt = $db->prepare($sql);
    $stmt->bindValue(1, $value, PDO::PARAM_INT);
    $stmt->execute();
    $row = $stmt->fetch(PDO::FETCH_ASSOC);
    var_dump($row);

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The var_dump just shows "boolean false".
elepilAsked:
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hieloCommented:
On your previous question I provided you with a reference link that covers OUT parameters.  If only you had read it!

Here it is again.  Look for "Calling stored procedures with an OUT parameter"
http://www.mysqltutorial.org/php-calling-mysql-stored-procedures/
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elepilAuthor Commented:
Thanks for the help.
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