WordPress at a glance
filter is not described

wp_title_parts filter-hook . WP 4.0.0

Filters the parts of the page title.

Usage

add_filter( 'wp_title_parts', 'filter_function_name_4523' );
function filter_function_name_4523( $title_array ){
	// filter...

	return $title_array;
}
$title_array(array)
Parts of the page title.

Where the hook is called

wp_title()
wp_title_parts
wp-includes/general-template.php 1202
$title_array = apply_filters( 'wp_title_parts', explode( $t_sep, $title ) );

Where the hook is used (in WP core)

Does not used.