WordPress at a glance
filter is not described

manage_users_custom_column filter-hook . WP 2.8.0

Filters the display output of custom columns in the Users list table.

Usage

add_filter( 'manage_users_custom_column', 'filter_function_name_4187', 10, 3 );
function filter_function_name_4187( $output, $column_name, $user_id ){
	// filter...

	return $output;
}
$output(string)
Custom column output.
Default: ''
$column_name(string)
Column name.
$user_id(int)
ID of the currently-listed user.

Where the hook is called

WP_Users_List_Table::single_row()
WP_MS_Users_List_Table::column_default()
wp-admin/includes/class-wp-users-list-table.php 525
$r .= apply_filters( 'manage_users_custom_column', '', $column_name, $user_object->ID );
wp-admin/includes/class-wp-ms-users-list-table.php 386
echo apply_filters( 'manage_users_custom_column', '', $column_name, $user->ID );

Where the hook is used (in WP core)

Does not used.