Code to test out isolation level. While this program is running execute a SQL SELECT statement on the same table and see if you get less than 10,000 records at any point

DB2 Commitment Control Isolation Level test.php

<?php
error_reporting(E_ALL & ~E_NOTICE);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);

for ($index = 0; $index < 10000; $index++)
{
    $insertdata[] = array('test');
}

$options = array('i5_commit' => DB2_I5_TXN_SERIALIZABLE,'autocommit' => DB2_AUTOCOMMIT_OFF);
$db2Connection = db2_connect('', '', '', $options);
if (!$db2Connection)
{
    echo "false - Connection failed.";exit();
}
$sql = "DELETE FROM MYLIB.MYTABLE";
$stmt = db2_exec($db2Connection, $sql);

$sql = "INSERT INTO MYLIB.MYTABLE (MYCOL1) VALUES(?)";
$insertstmt = db2_prepare($db2Connection, $sql);
foreach($insertdata as $row)
{
    try
    {
        $result = db2_execute($insertstmt, $row);
    } 
    catch (Exception $exc)
    {
        $result=false;
    }

    if($result==false)
    {
        echo db2_stmt_errormsg();
        echo "Dump of Array being inserted:<br>"; var_dump($row);
    }
}
//THIS WORKS - Commitment Control works, Isolation Levels do not (stopping others from reading the data as your modifying the table)
$commitResult = db2_rollback($db2Connection);
var_dump($commitResult);