Wordpress Admin AJAX Serialize

Instead of relying on bespoke/custom serialising, and the ancient admin AJAX, consider using JSON and the REST API, e.g.:

add_action( 'rest_api_init', function () {
        register_rest_route( 'ramkumar/v1', '/test/', array(
                'methods' => 'POST',
                'callback' => 'ramkumar_rest_test'
        ) );
} );

function ramkumar_rest_test( $request ) {
    $reviewer_notes = $request['reviewer_notes'];
    $result = ....;
    return $result; // gets sent to the browser as JSON, so return an object/array/etc
}

Now we have yoursite.com/wp-json/ramkumar/v1/test and can poke it like this:

jQuery.ajax({
    url: "/wp-json/ramkumar/v1/test",
    data: { review_note: "hello I'm a reviewer" }
}).done(function( data ) {
    // json decode data and do stuff with it
});

This also has the benefit of being more debuggable, easier to use, etc. The REST API can accept multiple extra parameters telling it how to validate, sanitise, and authenticate the request. It will also tell you in plain english what you did wrong if you make a mistake

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