Fatal error: Uncaught Error: Using $this when not in object context in /in/1S33Y:18
Stack trace:
#0 [internal function]: {closure}(Object(Tag), Object(Tag))
#1 /in/1S33Y(23): usort(Array, Object(Closure))
#2 /in/1S33Y(34): test()
#3 {main}
thrown in /in/1S33Y on line 18
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Using $this when not in object context in /in/1S33Y on line 18
Process exited with code 255.