WordPress at a glance
filter is not described

template_include filter-hook . WP 3.0.0

Filters the path of the current template before including it.

Usage

add_filter( 'template_include', 'filter_function_name_6518' );
function filter_function_name_6518( $template ){
	// filter...

	return $template;
}
$template(string)
The path of the template to include.

Where the hook is called

In file: /wp-includes/template-loader.php
template_include
wp-includes/template-loader.php 73
if ( $template = apply_filters( 'template_include', $template ) ) {

Where the hook is used (in WP core)

Does not used.