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<?php error_reporting(-1); $a = []; var_dump($a['key'] ?? true);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/gVsB4
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'error_reporting'
          1        SEND_VAL                                                 -1
          2        DO_ICALL                                                 
    4     3        ASSIGN                                                   !0, <array>
    5     4        INIT_FCALL                                               'var_dump'
          5        FETCH_DIM_IS                                     ~3      !0, 'key'
          6        COALESCE                                         ~4      ~3
          7        QM_ASSIGN                                        ~4      <true>
          8        SEND_VAL                                                 ~4
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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