foreach($mappings as $mapping)
{
  $data = unserialize($mapping->data);
  $data["computer"] = strip_tags($_POST['form']['user_computer']); // to table __hardware
  $data["menswear"] = strip_tags($_POST['form']['mens_clothing']); // to table __clothing
  $mapping->data = serialize($data);
}

$data["computer"] INSERTS INTO TABLE hardware.
$data["menswear"] INSERTS INTO TABLE clothing.

echo "<pre>";
print_r($mappings);
echo "</pre>";
die();

$data = unserialize($mappings[0]->data);
$morphA = strip_tags($_POST['form']['silent-user-register']);
$morphA = trim(preg_replace("#[^-a-zA-Z0-9]+#", " ", $morphA));
$morphA = ucwords(strtolower($morphA));
$morphB = strtolower($morphA);
$morphC = str_replace(" ", ".", $morphB);
$data["name"] = $morphA; // User enters: bob james jnr or BOB JAMES JNR - I change to; Bob James Jnr
$data["username"] = $morphC; // Bob James Jnr becomes: bob.james.jnr
$data["email"] = $morphC ."@business-email.com"; // email is crafted to: bob.james.jnr@business-emai.com
$mappings[0]->data = serialize($data);
 
// Its almost foolproof, I haven't factored in the potential for duplicated usernames as we only have 150 employees
// This should be enough to capture new employees I I may have overlooked
// $mappings[0] is the first sub-array (stdClass object) in the master $mappings array.

Array
(
    [0] => stdClass Object
        (
            [id] => 4
            [formId] => 3
            [connection] => 0
            [host] => 
            [port] => 3306
            [username] => admin
            [password] => secret
            [database] => 
            [method] => 0
            [table] => joomla_users
            [data] => a:8:{s:2:"id";s:16:"{last_insert_id}";s:4:"name";s:14:"Bob James Jnr";s:8:"username";s:14:"bob.james.jnr";s:5:"email";s:38:"bob.james.jnr@business-name.com";s:8:"password";s:60:"$2y$10$vQMqQAaSm6p17QtLqUMEPu79edGi5GQWr8ezgMyY0ilpUT5nOYPXS";s:12:"registerDate";s:19:"{global:date_added}";s:13:"lastvisitDate";s:19:"0000-00-00 00:00:00";s:13:"lastResetTime";s:19:"0000-00-00 00:00:00";}
            [wheredata] => a:0:{}
            [extra] => a:0:{}
            [andor] => a:0:{}
            [ordering] => 1
        )
 
    [1] => stdClass Object
        (
            [id] => 5
            [formId] => 3
            [connection] => 0
            [host] => 
            [port] => 3306
            [username] => admin
            [password] => secret
            [database] => 
            [method] => 0
            [table] => joomla_user_usergroup_map
            [data] => a:2:{s:7:"user_id";s:16:"{last_insert_id}";s:8:"group_id";s:1:"2";}
            [wheredata] => a:0:{}
            [extra] => a:0:{}
            [andor] => a:0:{}
            [ordering] => 2
        )
 
)