Complete the order from a link to the Edit order screen

woocommerce-complete-order-from-link-to-edit-order-screen

add_action( 'admin_init', 'vanbo_update_order_status', 10 );
function vanbo_update_order_status() {
	
	// We need the 'post', 'action' = edit, and 'prefix-change-status' to be set.
	// If even one is not set, bail
	if ( ! isset( $_GET['post'] )
	     || ( ! isset( $_GET['action'] ) || 'edit' != $_GET['action'] )
	     || ! isset( $_GET['prefix-change-status'] ) ) {
		return;
	}
	
	// Get the order and the status name
	$order = wc_get_order( (int) wc_clean( $_GET['post'] ) );
	$status = wc_clean( $_GET['prefix-change-status'] ) ? wc_clean( $_GET['prefix-change-status'] ) : 'completed';
	
	// Set the order status
	$order->set_status( $status );
	$order->save();
}