WordPress at a glance
filter is not described

post_format_rewrite_base filter-hook . WP 3.1.0

Filters the post formats rewrite base.

Usage

add_filter( 'post_format_rewrite_base', 'filter_function_name_3128' );
function filter_function_name_3128( $context ){
	// filter...

	return $context;
}
$context(string)
Context of the rewrite base.
Default: 'type'

Where the hook is called

create_initial_taxonomies()
wp-includes/taxonomy.php 38
$post_format_base = apply_filters( 'post_format_rewrite_base', 'type' );

Where the hook is used (in WP core)

Does not used.