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<?php var_dump(['foo' => function ($arg) { var_dump($arg); }]['foo']);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GalTQ
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        DECLARE_LAMBDA_FUNCTION                          ~0      [0]
          2        INIT_ARRAY                                       ~1      ~0, 'foo'
          3        FETCH_DIM_R                                      ~2      ~1, 'foo'
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
          6      > RETURN                                                   1


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GalTQ
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $arg
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
          0  E >   RECV                                             !0      
          1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
          4      > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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