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<?php $arr = ['one', 'two']; $val = $arr[3] ?? 'three'; var_dump($val);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/EYmTb
function name:  (null)
number of ops:  9
compiled vars:  !0 = $arr, !1 = $val
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   5     1        FETCH_DIM_IS                                     $3      !0, 3
         2        COALESCE                                         ~4      $3
         3        QM_ASSIGN                                        ~4      'three'
         4        ASSIGN                                                   !1, ~4
   6     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !1
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0