WordPress at a glance
filter is not described

manage_posts_columns filter-hook . WP 1.5.0

Filters the columns displayed in the Posts list table.

Usage

add_filter( 'manage_posts_columns', 'filter_function_name_9498', 10, 2 );
function filter_function_name_9498( $posts_columns, $post_type ){
	// filter...

	return $posts_columns;
}
$posts_columns(array)
An array of column names.
$post_type(string)
The post type slug.

Where the hook is called

WP_Posts_List_Table::get_columns()
manage_posts_columns
wp-admin/includes/class-wp-posts-list-table.php 596
$posts_columns = apply_filters( 'manage_posts_columns', $posts_columns, $post_type );

Where the hook is used (in WP core)

Does not used.