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<?php echo implode( array_keys( array_intersect( array_count_values( str_split('abclkjabc'), ), [1] ) ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qWQju
function name:  (null)
number of ops:  16
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    4     0  E >   INIT_FCALL                                                   'array_keys'
    5     1        INIT_FCALL                                                   'array_intersect'
    6     2        INIT_FCALL                                                   'array_count_values'
    7     3        INIT_FCALL                                                   'str_split'
          4        SEND_VAL                                                     'abclkjabc'
          5        DO_ICALL                                             $0      
          6        SEND_VAR                                                     $0
    6     7        DO_ICALL                                             $1      
    7     8        SEND_VAR                                                     $1
    9     9        SEND_VAL                                                     <array>
    5    10        DO_ICALL                                             $2      
    9    11        SEND_VAR                                                     $2
    4    12        DO_ICALL                                             $3      
    3    13        FRAMELESS_ICALL_1                implode             ~4      $3
    9    14        ECHO                                                         ~4
   12    15      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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