PROBABLY BUG OF PEAR OCI CLASS

I'm a web developer in php and i'm tryng to call oracle stored procedure with the PEAR DB interface. The problem is: i call a strode procedure that have 1 IN parameter and 1 OUT parameter, When I call the execute mehod and i read the value of the out parameter i can read only the first character of the out parameter value. I think that the problem is due to the call if (!@OCIBindByName($stmt, ":bind" . $i, $pdata[$i], -1)) { of the execute method of class DB_oci8 in which the length parameter is always 1. I'm trying specify a length more than 0 and it seems to works, but the question is: "How is the correct way to do this call".??? Thank in advance!! My example code is: $stmt = $DBH->prepare ("call stored_proc (?,?,?)"); if (DB::isError ($stmt)) die ("prepare() failed: " . $stmt->getMessage () . "\n"); $param=array($in_par,&$out_par); $result = $DBH->execute ($stmt,$param); if (DB::isError($result)) { print "execute() failed: " . $result->getMessage() . "\n"; }