WooCommerce - Modify order name depending on the state

modify_order_name_by_state.php

<?php

/**
 * @snippet       Modify order name depending on the state
 * @author        Foco Azul - Adrian Fernandez
 * @testedwith    WooCommerce 3.8
 */

function change_woocommerce_new_order_data($order, $data)
{
	// Order name prefixes
	// They have to be equal to html <option> values
	$prefixes = [
		'S' => 'SC - ',
		'H' => 'BE - ',
		'B' => 'CH - ',
		'C' => 'CB - ',
		'L' => 'LP - ',
		'O' => 'OR - ',
		'N' => 'PD - ',
		'P' => 'PT - ',
		'T' => 'TR - ',
	];
	$state = $order->get_billing_state();

	$name = $order->get_billing_first_name();
	try {
		$order->set_billing_first_name($prefixes[$state] . $name);
	} catch (\Throwable $th) {
		$order->set_billing_first_name('OTRO - ' . $name);
	}
}

// add the action 
add_action('woocommerce_checkout_create_order', 'change_woocommerce_new_order_data', 10, 2);