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<?php $a = []; var_dump((bool) $a['t'] ?? null);
based on C35Aa
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/IVJ8C
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   5     1        INIT_FCALL                                               'var_dump'
         2        FETCH_DIM_R                                      $2      !0, 't'
         3        CAST                                         13  ~3      $2
         4        COALESCE                                         ~4      ~3
         5        QM_ASSIGN                                        ~4      null
         6        SEND_VAL                                                 ~4
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0