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<?php $undef; $nothing = $undef; var_dump($nothing); debug_zval_dump('nothing');
based on R8DMh
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/3gfKl
function name:  (null)
number of ops:  8
compiled vars:  !0 = $undef, !1 = $nothing
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   ASSIGN                                                   !1, !0
   5     1        INIT_FCALL                                               'var_dump'
         2        SEND_VAR                                                 !1
         3        DO_ICALL                                                 
   6     4        INIT_FCALL                                               'debug_zval_dump'
         5        SEND_VAL                                                 'nothing'
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0