Description:
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From manual page: http://www.php.net/pdo.prepared-statements
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As per the current implementation, out parameters won't work. Trying to execute the code in examples 4 and 5 will throw the error:

"SQLSTATE[42000]: Syntax error or access violation: 1414 OUT or INOUT argument 3 for routine test_table.baz is not a variable or NEW pseudo-variable in BEFORE trigger".

Even when setting the attribute PDO::ATTR_EMULATE_PREPARES to 0, the bound variables won't be updated with the out parameters.
This issue has been reported and explained here: https://bugs.mysql.com/bug.php?id=69206 and here: https://bugs.php.net/bug.php?id=64640.

Expected result:
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Execution of the stored procedure.

Actual result:
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SQLSTATE[42000]: Syntax error or access violation: 1414 OUT or INOUT argument 3 for routine test_table.baz is not a variable or NEW pseudo-variable in BEFORE trigger