Page Comparison

// Save $data:
[
    'RECID' => 'addNew', // for Insert, or an integer for Update
    'COLUMN_2' => 'Foo',
    'COLUMN_3' => 'Bar',
    // ...
]
 

// $data's contents:
[
    1234 => [
        'RECID' => 1234,
        'COLUMN_2' => 'Foo',
        'COLUMN_3' => 'Bar',
        // ...
    ],
    5678 => [
        'RECID' => 5678,
        'COLUMN_2' => 'Foo Too',
        'COLUMN_3' => 'Bar None',
        // ...
    ],
]