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<?php $input = ['a', 'c', 'a', 'b', 'c', 'c']; $count = array_count_values($input); $duplicated = array_keys(array_diff($count, [1])); var_export($duplicated); echo PHP_EOL; echo implode(", ", $duplicated);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/2HS8e
function name:  (null)
number of ops:  20
compiled vars:  !0 = $input, !1 = $count, !2 = $duplicated
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    4     1        INIT_FCALL                                                   'array_count_values'
          2        SEND_VAR                                                     !0
          3        DO_ICALL                                             $4      
          4        ASSIGN                                                       !1, $4
    5     5        INIT_FCALL                                                   'array_keys'
          6        INIT_FCALL                                                   'array_diff'
          7        SEND_VAR                                                     !1
          8        SEND_VAL                                                     <array>
          9        DO_ICALL                                             $6      
         10        SEND_VAR                                                     $6
         11        DO_ICALL                                             $7      
         12        ASSIGN                                                       !2, $7
    6    13        INIT_FCALL                                                   'var_export'
         14        SEND_VAR                                                     !2
         15        DO_ICALL                                                     
    7    16        ECHO                                                         '%0A'
    8    17        FRAMELESS_ICALL_2                implode             ~10     '%2C+', !2
         18        ECHO                                                         ~10
         19      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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