Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.

ini_set('display_errors','on');
$sSql =  'call wb_utils.ReportOrder(:var0,:out0,:var1,:var2,:var3)';
$sOut = '                    ';
$aArguments = Array
(
'var0' => 24277102,
'var1' => '',
'var2' => 'args',
'var3' => 'cols'
);

$sDsn = 'oci:dbname=//saturn.icon3.ru/mito';
$sUser = 'XXX';
$sPass  = 'XXXXXX';
$aArgs = array();

$oPDOs = new PDO($sDsn,$sUser,$sPass,$aArgs);
/* !!! IF COMMENT LINE BELOW, NO ERROR */
$oPDOs->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
/**/
$oStat = $oPDOs->prepare( $sSql );
$oStat->bindParam('out0',$sOut, PDO::PARAM_STR,strlen( $sOut ) );
$oStat->execute($aArguments);
echo '['.$sOut.']';

>If the script requires a database to demonstrate the issue,
>please make sure it creates all necessary tables, stored >procedures etc.

$sSql =  'call ReportOrder(:var0,:out0,:var1,:var2,:var3)';

CREATE OR REPLACE PROCEDURE ReportOrder
(
	dFormId NUMBER, dCalcId OUT VARCHAR2, sUnionDescr VARCHAR2, sArgsName VARCHAR2, sColsName VARCHAR2
) IS
BEGIN
	dCalcId := '1';
END;

!!! WRONG !!! :
/* !!! IF COMMENT LINE BELOW, NO ERROR */
$oPDOs->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
/**/
if i comment this lines error i can look error, when i call method errorInfo( )!

print_r( $oStat->errorInfo( ) );

i can temporary resolve this problem by this code:

$sSql =  'call ReportOrder( :out0, :var0 , :var1)';
$sOut = '                    ';
$sVar0 = null;

$aArguments = Array ('var0' =>'asdasasdasd','var1' =>'3242424' );

$sDsn = 'oci:dbname=********';
$sUser = '***';
$sPass  = '*******';
$aArgs = array();

$oPDOs = new PDO($sDsn,$sUser,$sPass,$aArgs);

$oStat = $oPDOs->prepare( $sSql );
$oStat->bindParam('out0', $sOut, PDO::PARAM_STR,strlen( $sOut ) );
/* !!!!!! this CODE  !!!!*/
$oStat->bindParam('var0',$sVar0 );
$oStat->bindParam('var1',$sVar0 );
/* !!!!!!********!!!!*/
$oStat->execute($aArguments);
echo '['.$sOut.']';
?>

PLSQL PROC :

CREATE OR REPLACE PROCEDURE ReportOrder
(
	dCalcId OUT VARCHAR2, dFormId VARCHAR2, dFormId1 VARCHAR2
) IS
BEGIN
	dCalcId := dFormId || dFormId1;
END;

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

This bug is still exists in both PHP versions (5.2.12 & 5.3.1)

I've set up two test VMs and am quite willing to help get this working. 

the following simple code easily re-produces the bug:

try {
                $dbConn = new PDO('oci:dbname=.....);
                $dbConn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                $sql = $dbConn->prepare("
                                BEGIN
                                        SELECT  username
                                        INTO    :chkId
                                        FROM    USERS
                                        WHERE   username = 'fred';
                                END;
                                ");
                $sql->bindParam('chkId', $chkId);
                $sql->execute();
                var_dump($chkId);
        } catch (Exception $e) {
                var_dump($e);
        }

obviously I've censored our connection info.

as the other user mentioned if I alter the bindParam to:

$sql->bindParam('chkId', $chkId, PDO::PARAM_STR, 10);

it works. however even missing off the variable length causes a error