检查PHP对象数组中的对象数是否小于1

I am trying to check whether the number of items in an object is less than one like this:

if ( count($trailhead_list->o < 1 ) )

It always returns true even if there is some items there.

You have an error in your brackets, it should read like that:

if ( count($trailhead_list->o) < 1)