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<?php $a = '_SERVER'; $b = 'HTTP_HOST'; $c = $$a; var_export($c[$b]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/pgT9B
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a, !1 = $b, !2 = $c
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '_SERVER'
    4     1        ASSIGN                                                   !1, 'HTTP_HOST'
    6     2        FETCH_R                      local               ~5      !0
          3        ASSIGN                                                   !2, ~5
    8     4        INIT_FCALL                                               'var_export'
          5        FETCH_DIM_R                                      ~7      !2, !1
          6        SEND_VAL                                                 ~7
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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