WordPress at a glance
filter is not described

post_type_archive_title filter-hook . WP 3.1.0

Filters the post type archive title.

Usage

add_filter( 'post_type_archive_title', 'filter_function_name_2249', 10, 2 );
function filter_function_name_2249( $post_type_name, $post_type ){
	// filter...

	return $post_type_name;
}
$post_type_name(string)
Post type 'name' label.
$post_type(string)
Post type.

Where the hook is called

post_type_archive_title()
wp-includes/general-template.php 1298
$title = apply_filters( 'post_type_archive_title', $post_type_obj->labels->name, $post_type );

Where the hook is used (in WP core)

Does not used.