Sometimes you might want to conditionally load something for the "blog" section of your Genesis website. As sites get more complex, it can be useful to load different elements conditionally and avoid duplicating code. This is one example of how you can do that.

genesis_is_blog.php

<?php

/**
 * Helper function to determine if we're on a blog section of a Genesis site.
 *
 * @return  bool True if we're on any section of the blog.
 * @author  Robert Neu
 */
function prefix_is_blog() {
	$is_blog = array(
		'blog_template' => is_page_template( 'blog.php' ),
		'single_post'   => is_singular( 'post' ),
		'archive'       => is_archive() && ! is_post_type_archive(),
		'home'          => is_home() && ! is_front_page(),
	);
	if ( in_array( true, $is_blog ) ) {
		return true;
	}
	return false;
}

// Usage Example:

add_action( 'genesis_after_header', 'prefix_change_blog_sidebar' );
//* Swap default sidebar for the blog sidebar on blog posts and archives
function prefix_change_blog_sidebar() {
	if ( ! prefix_is_blog() ) {
		return;
	}

	if ( is_active_sidebar( 'blog-sidebar' ) ) {
		remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
		add_action( 'genesis_sidebar', 'prefix_do_blog_sidebar' );
	}
}

//* Display a blog sidebar.
function prefix_do_blog_sidebar() {
	dynamic_sidebar( 'blog-sidebar' );
}