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<?php $first_test = null; $first_test ??= 'not started'; var_dump($first_test);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GTN0r
function name:  (null)
number of ops:  9
compiled vars:  !0 = $first_test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    4     1        COALESCE                                         ~2      !0
          2        ASSIGN                                           ~3      !0, 'not+started'
          3        QM_ASSIGN                                        ~2      ~3
          4        FREE                                                     ~2
    6     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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