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<?php $data = array('status.1', 'status.2', 'status.3', 'country.244', 'country.24', 'country.845', 'pm.4', 'pm.9', 'pm.6'); $groupedData = array_map(function($arg) { [$key, $val] = explode('.', $arg); return array($key => $val); }, $data); var_dump(array_column($groupedData, 'country'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rVQ2T
function name:  (null)
number of ops:  15
compiled vars:  !0 = $data, !1 = $groupedData
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        INIT_FCALL                                               'array_map'
          2        DECLARE_LAMBDA_FUNCTION                          ~3      [0]
    8     3        SEND_VAL                                                 ~3
          4        SEND_VAR                                                 !0
    5     5        DO_ICALL                                         $4      
          6        ASSIGN                                                   !1, $4
   10     7        INIT_FCALL                                               'var_dump'
          8        INIT_FCALL                                               'array_column'
          9        SEND_VAR                                                 !1
         10        SEND_VAL                                                 'country'
         11        DO_ICALL                                         $6      
         12        SEND_VAR                                                 $6
         13        DO_ICALL                                                 
         14      > 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/rVQ2T
function name:  {closure}
number of ops:  13
compiled vars:  !0 = $arg, !1 = $key, !2 = $val
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   RECV                                             !0      
    6     1        INIT_FCALL                                               'explode'
          2        SEND_VAL                                                 '.'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $3      
          5        FETCH_LIST_R                                     $4      $3, 0
          6        ASSIGN                                                   !1, $4
          7        FETCH_LIST_R                                     $6      $3, 1
          8        ASSIGN                                                   !2, $6
          9        FREE                                                     $3
    7    10        INIT_ARRAY                                       ~8      !2, !1
         11      > RETURN                                                   ~8
    8    12*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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