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<?php $host = 'host.dupa.com'; $parts = explode('.', $host, -3); echo $parts[-1] .'.'. $parts[-2];
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QfhME
function name:  (null)
number of ops:  13
compiled vars:  !0 = $host, !1 = $parts
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'host.dupa.com'
    5     1        INIT_FCALL                                               'explode'
          2        SEND_VAL                                                 '.'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 -3
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !1, $3
    7     7        FETCH_DIM_R                                      ~5      !1, -1
          8        CONCAT                                           ~6      ~5, '.'
          9        FETCH_DIM_R                                      ~7      !1, -2
         10        CONCAT                                           ~8      ~6, ~7
         11        ECHO                                                     ~8
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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