Make thumbnails 16:9

Thanks, managed to get this code to do it:

<?php
add_filter( ‘is_ajax_image_size’, ‘my_ajax_image_size’, 10, 1 );
function my_ajax_image_size( $image_size ) {
// Check if the current image size is the default thumbnail size
if ( $image_size === ‘thumbnail’ ) {
// Set the new image size to the desired aspect ratio (16:9)
$new_size = array( round( 16 / 9 * get_option( ‘thumbnail_size_w’ ) ), get_option( ‘thumbnail_size_h’ ) );
$image_size = $new_size;
}

// Return the modified image size
return $image_size;
}