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<?php var_dump(isset($_ENV['HPHP_SERVER']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HZrLS
function name:  (null)
number of ops:  6
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        FETCH_IS                                         ~0      '_ENV'
          2        ISSET_ISEMPTY_DIM_OBJ                         0  ~1      ~0, 'HPHP_SERVER'
          3        SEND_VAL                                                 ~1
          4        DO_ICALL                                                 
          5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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