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<?php $sys = 0; $admin = 1; $right = 123; $a = []; var_export($right !== $sys && $a[$admin] ?? null);
based on tYdYs
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 46) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
Jump found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
filename:       /in/4VQtn
function name:  (null)
number of ops:  14
compiled vars:  !0 = $sys, !1 = $admin, !2 = $right, !3 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, 0
   3     1        ASSIGN                                                   !1, 1
   4     2        ASSIGN                                                   !2, 123
   5     3        ASSIGN                                                   !3, <array>
   7     4        INIT_FCALL                                               'var_export'
         5        IS_NOT_IDENTICAL                                 ~8      !2, !0
         6      > JMPZ_EX                                          ~8      ~8, ->9
         7    >   FETCH_DIM_R                                      $9      !3, !1
         8        BOOL                                             ~8      $9
         9    >   COALESCE                                         ~10     ~8
        10        QM_ASSIGN                                        ~10     null
        11        SEND_VAL                                                 ~10
        12        DO_ICALL                                                 
        13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0