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$counts = array_count_values($array); $duplicates = array_filter($counts, fn($count) => $count > 1); print_r(array_keys($duplicates));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/eAm6A
function name:  (null)
number of ops:  18
compiled vars:  !0 = $array, !1 = $counts, !2 = $duplicates
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
  239     1        INIT_FCALL                                               'array_count_values'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                         $4      
          4        ASSIGN                                                   !1, $4
  240     5        INIT_FCALL                                               'array_filter'
          6        SEND_VAR                                                 !1
          7        DECLARE_LAMBDA_FUNCTION                          ~6      [0]
          8        SEND_VAL                                                 ~6
          9        DO_ICALL                                         $7      
         10        ASSIGN                                                   !2, $7
  242    11        INIT_FCALL                                               'print_r'
         12        INIT_FCALL                                               'array_keys'
         13        SEND_VAR                                                 !2
         14        DO_ICALL                                         $9      
         15        SEND_VAR                                                 $9
         16        DO_ICALL                                                 
         17      > 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/eAm6A
function name:  {closure}
number of ops:  4
compiled vars:  !0 = $count
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  240     0  E >   RECV                                             !0      
          1        IS_SMALLER                                       ~1      1, !0
          2      > RETURN                                                   ~1
          3*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0

preferences:
146.09 ms | 1008 KiB | 17 Q