Description:
------------
Using the example in the PHP docs for binding an INOUT in a stored 
procedure, the process appears to fail

http://us3.php.net/manual/en/pdo.prepared-statements.php

see example 5

The principle difference between this and Bug #35935 is that 

$stmt->bindParam(1, $value, PDO::PARAM_STR|PDO::PARAM_INPUT_OUTPUT, 10); 

In the code was not presented, which should address the issue.

Reproduce code:
---------------
MySQL 5.0.67
EITHER OF THE FOLLOWING:
1)
CREATE PROCEDURE `tablename`.`sp_takes_string_returns_string`(INOUT str VARCHAR(10))
BEGIN
SELECT 'world' INTO str;
END;

2)
CREATE PROCEDURE `tablename`.`sp_takes_string_returns_string`(INOUT str VARCHAR(10))
BEGIN
SET str = 'world'
END;


PHP:
$dbh = new PDO($server.':host='.$host.';dbname='.$catalog, $username, $password, array(PDO::ATTR_PERSISTENT => true));
$stmt = $dbh->prepare("CALL sp_takes_string_returns_string(?)");
$value = 'hello';
$stmt->bindParam(1, $value, PDO::PARAM_STR|PDO::PARAM_INPUT_OUTPUT, 10); 

// call the stored procedure
$stmt->execute();

print "procedure returned $value\n";


Expected result:
----------------
procedure returned world

Actual result:
--------------
procedure returned hello