WordPress at a glance
filter is not described

wp_link_pages_args filter-hook . WP 3.0.0

Filters the arguments used in retrieving page links for paginated posts.

Usage

add_filter( 'wp_link_pages_args', 'filter_function_name_9446' );
function filter_function_name_9446( $params ){
	// filter...

	return $params;
}
$params(array)
An array of arguments for page links for paginated posts.

Where the hook is called

wp_link_pages()
wp_link_pages_args
wp-includes/post-template.php 889
$r = apply_filters( 'wp_link_pages_args', $params );

Where the hook is used (in WP core)

Does not used.