#wordpress-mu

I’m setting up a blog network using WordPress multi-user / multi-site a.k.a. WordPress network. Each new blog should be looking good from the start and the current header image is a real blotch.

There are a number of approaches to solve this:

Create a child theme

Make changes in the current theme, by editing the code in the relevant files / Replace the bad-looking standard picture in the folder.

Create a plugin

Edit the functions.php file

I had a good time suffering. Mentally. I knew instantly that a plugin would be best for me. But how to make it happen?

The solution that works for plugin, child theme and functions.php is to work with a filter in twenty seventeen.

In inc/custom_header.php the following function is written, to apply custom-header:

add_theme_support( 'custom-header', apply_filters('twentyseventeen_custom_header_args', array(

'default-image'      => get_parent_theme_file_uri( '/assets/images/header.jpg' ), 'width'              => 2000, 'height'             => 1200, 'flex-height'        => true, 'video'              => true, 'wp-head-callback'   => 'twentyseventeen_header_style', ) ) );

The interesting part with this is the apply_filters(’twentyseventeen_custom_header_args’, ...). It means there is a filter added for the header arguments. Let’s use that!

function  my_function_that_changes_header_options ($args) { $args ['default-image'] = ''; // Sets the default-image to nothing. return $settings; }

add_filter('twentyseventeen_custom_header_args','my_function_that_changes_header_options');