Load all breakpoint groups as select options.
array An array containing breakpoint group labels indexed by their ids.
function breakpoint_group_select_options() {
$options = array();
$breakpoint_groups = entity_load_multiple('breakpoint_group');
foreach ($breakpoint_groups as $breakpoint_group) {
$options[$breakpoint_group
->id()] = $breakpoint_group
->label();
}
asort($options);
return $options;
}