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<?php $array = [ [1, 2, 3], [4, 5, 6] ]; var_export( array_map( fn($row) => array_merge(['X'], $row), $array ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/O3lsX
function name:  (null)
number of ops:  10
compiled vars:  !0 = $array
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    7     1        INIT_FCALL                                               'var_export'
    8     2        INIT_FCALL                                               'array_map'
    9     3        DECLARE_LAMBDA_FUNCTION                          ~2      [0]
          4        SEND_VAL                                                 ~2
   10     5        SEND_VAR                                                 !0
    8     6        DO_ICALL                                         $3      
   10     7        SEND_VAR                                                 $3
    7     8        DO_ICALL                                                 
   12     9      > 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/O3lsX
function name:  {closure}
number of ops:  7
compiled vars:  !0 = $row
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   RECV                                             !0      
          1        INIT_FCALL                                               'array_merge'
          2        SEND_VAL                                                 <array>
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $1      
          5      > RETURN                                                   $1
          6*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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