Description:
------------
Inserting large multibyte strings works fine,
reading them back in results in only 8192 characters read (=24576 bytes).

Even if inserting mixed single-multibyte strings, reading caps at 8192 
characters (even though the byte count is far less).

Inserting and reading 100000 single bytes work, though.

Attached a file with more debug output.

== PHP ==

We are using ZendServer 5.5.0:

PHP 5.3.8-ZS5.5.0 (cli) (built: Aug 23 2011 05:20:27)
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies

But this bug also is on PHP 5.4.0RC8-dev

== Oracle ==

Oracle XE 10.2.0.1, but also on Enterprise 10.2.0.4.0.
Characterset: AL32UTF8

Test table:

create table TEST_LOB (
    tl_id         NUMBER(3),
    tl_byte_16    VARCHAR2(16 BYTE),
    tl_char_16    VARCHAR2(16 CHAR),
    tl_byte_4000  VARCHAR2(4000 BYTE),
    tl_char_4000  VARCHAR2(4000 CHAR),
    tl_blob       BLOB,
    tl_clob       CLOB,
    tl_date       DATE,
    tl_number     NUMBER
)


Test script:
---------------
$dsn = 'oci:dbname=(DESCRIPTION=(ADDRESS_LIST=(
                ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
                (CONNECT_DATA=(SID=xe)));charset=AL32UTF8';
$username = 'USER';
$password = 'PW';
$lobTestTablename = 'TEST_LOB';
$id = -1;
$clobData = str_repeat('…', 8193);

$pdo = new PDO($dsn, $username, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->exec("delete from $lobTestTablename where tl_id < 0");
$pdoStmt = $pdo->prepare("insert into $lobTestTablename (tl_id, tl_clob) values (?, ?)");
$pdoStmt->bindParam(1, $id, PDO::PARAM_INT, null, null);
$pdoStmt->bindParam(2, $clobData, PDO::PARAM_STR, strlen($clobData), null);
$pdoStmt->execute();
$pdoStmt = $pdo->query("select * from $lobTestTablename where TL_ID = $id");
$row = $pdoStmt->fetch(PDO::FETCH_ASSOC);
$dataRead = stream_get_contents($row['TL_CLOB']);
printf("values equal: %s\n", var_export($clobData === $dataRead, true));

Expected result:
----------------
values equal: false

Actual result:
--------------
values equal: true