Hero header for category archive with Genesis (and CMB2) - Overlay category title on category image - https://www.damiencarbery.com/2019/12/hero-header-for-category-archive-with-genesis-and-cmb2/

category-hero-image-cmb2.php

<?php
/*
Plugin Name: Hero header for category archive with Genesis (and CMB2)
Plugin URI: https://www.damiencarbery.com/2019/12/hero-header-for-category-archive-with-genesis-and-cmb2/
Description: Overlay category title on category image.
Author: Damien Carbery
Author URI: https://www.damiencarbery.com
Version: 0.2
*/


add_action( 'cmb2_admin_init', 'dcwd_category_image_metabox' );
function dcwd_category_image_metabox() {
	$cmb = new_cmb2_box( array(
		'id'            => 'dcwd_category_image',
		'title'         => 'Category Hero Image',
		'object_types'  => array( 'term', ),
		'taxonomies'    => array( 'category' ),
		'context'       => 'normal',
		'priority'      => 'high',
		'show_names'    => true, // Show field names on the left
	) );
	$cmb->add_field( array(
		'name' => 'Choose category hero image',  // This is not needed here.
		'desc' => 'Choose an image 1600 wide x 1067 tall.',
		'type' => 'file',
		'id'   => 'hero_image'
	) );
}


add_action( 'genesis_after_header', 'dcwd_archive_hero_image' );
function dcwd_archive_hero_image() {
	// if we are not on a category archive, abort.
	if ( !is_category() ) {
		return;
	}
	
	global $wp_query;
	$term = is_tax() ? get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) ) : $wp_query->get_queried_object(); 
	if ( ! $term ) {
		return;
	}
	$image = get_term_meta( $term->term_id, 'hero_image', true );
?>
	<div class="post-hero" style="background-image: url('<?php echo $image; ?>')">
		<div class="wrap">
			<?php genesis_do_taxonomy_title_description(); ?>
		</div>
	</div>
<?php
	// Category title displayed above so remove the default location.
	remove_action( 'genesis_before_loop', 'genesis_do_taxonomy_title_description', 15 );
}


// Verify that CMB2 plugin is active.
add_action( 'admin_notices', 'verify_cmb2_active' );
function verify_cmb2_active() {
	if ( ! defined( 'CMB2_LOADED' ) ) {
		$plugin_data = get_plugin_data( __FILE__ );
		$plugin_name = $plugin_data['Name'];
?>
<div class="notice notice-warning is-dismissible"><p>Plugin <strong><?php echo $plugin_name; ?></strong> requires <a href="https://wordpress.org/plugins/cmb2/">CMB2 plugin</a>.</p></div>
<?php
		//error_log( 'CMB2 is not active.' );
	}
}