bindParam gave strange result on query.php

I found some strange result from variable reference on bindParam and gave me quite a lot to figure out what happened with the strange result. I do not know if this issue results from PDO library or Zeta.

My test on QueryInsert library on testingSeveralInsertOnDatabase section give me the strange result:
and Here is chunk of test code:
{{{
...
function testingSeveralInsertOnDatabase()

{ $q = $this->q; $section = 'Norway'; $company = 'cfSystem'; $q->insertInto('query_test') ->set( 'id', 1 ) ->set( 'section', $q->bindParam( $section ) ) ->set( 'company', $q->bindParam( $company ) ) ->set( 'employees', 20 ); $statement = $q->prepare(); $statement->execute(); $company = 'IBM'; $section = 'Norway'; $q->insertInto('query_test') ->set( 'id', 2 ) ->set( 'employees', 70 ); $statement = $q->prepare(); $statement->execute(); $db = Core\Singleton::get(); $q = $db->createSelectQuery(); $e = $q->expr; $q->select('*') ->from('query_test'); $statement = $q->prepare(); $statement->execute(); $result = $statement->fetchAll(); /* $this->dump( $result ); */ $q->reset(); $q->select('*') ->from('query_test') ->where( $e->eq( 'id', 1 ) ); $statement = $q->prepare(); $statement->execute(); $result = $statement->fetchAll(); $this->assertEqual( 1, $result[0]['id'] ); $this->assertEqual( 'cfSystem', $result[0]['company'] ); $q->reset(); $q->select('*') ->from('query_test') ->where( $e->eq( 'id', 2 ) ); $statement = $q->prepare(); $statement->execute(); $result = $statement->fetchAll(); $this->assertEqual( 2, $result[0]['id'] ); $this->assertEqual( 'IBM', $result[0]['company'] ); }

...
}}}

I am expecting result for this:
{{{
Array
(
[0] => Array
(
[id] => 1
[0] => 1
[company] => cfSystem
[1] => cfSystem
[section] => Norway
[2] => Norway
[employees] => 20
[3] => 20
)

[1] => Array
(
[id] => 2
[0] => 2
[company] => IBM
[1] => IBM
[section] => Norway
[2] => Norway
[employees] => 70
[3] => 70
)

)
}}}

but the component gives me result of this:
{{{
Array
(
[0] => Array
(
[id] => 1
[0] => 1
[company] => cfSystem
[1] => cfSystem
[section] => cfSystem
[2] => cfSystem
[employees] => 20
[3] => 20
)

[1] => Array
(
[id] => 2
[0] => 2
[company] => IBM
[1] => IBM
[section] => IBM
[2] => IBM
[employees] => 70
[3] => 70
)

)
}}}

I suspect this issue arises from & (by-reference) operator of bindParam method on ezcQuery class.
My quick-fix is change code on ezcQuery class, doBind method from bindParam to bindValue since BindValue have exactly what result I needed.

{{{
...
foreach( $this->boundParameters as $key => $val )
{
try

{ /* $statement->bindParam( $key, $val, $this->boundParametersType[$key] ); */ $statement->bindValue( $key, $val, $this->boundParametersType[$key] ); }

catch( \PDOException $e ) { }
}
...
}}}

tha'ts all