WordPress at a glance
filter is not described

manage_(post_type)_posts_columns filter-hook . WP 3.0.0

Filters the columns displayed in the Posts list table for a specific post type.

The dynamic portion of the hook name, $post_type, refers to the post type slug.

Usage

add_filter( 'manage_(post_type)_posts_columns', 'filter_function_name_918' );
function filter_function_name_918( $post_columns ){
	// filter...

	return $post_columns;
}
$post_columns(array)
An array of column names.

Where the hook is called

WP_Posts_List_Table::get_columns()
wp-admin/includes/class-wp-posts-list-table.php 608
return apply_filters( "manage_{$post_type}_posts_columns", $posts_columns );

Where the hook is used (in WP core)

Does not used.