WordPress at a glance
filter is not described

wp_unique_post_slug filter-hook . WP 3.3.0

Filters the unique post slug.

Usage

add_filter( 'wp_unique_post_slug', 'filter_function_name_5503', 10, 6 );
function filter_function_name_5503( $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug ){
	// filter...

	return $slug;
}
$slug(string)
The post slug.
$post_ID(int)
Post ID.
$post_status(string)
The post status.
$post_type(string)
Post type.
$post_parent(int)
Post parent ID
$original_slug(string)
The original post slug.

Where the hook is called

wp_unique_post_slug()
wp-includes/post.php 4032
return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );

Where the hook is used (in WP core)

Does not used.