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<?php $array = [ [1 => 'french', 2 => 'dutch'], [1 => 'french', 3 => 'english'], [1 => 'dutch'], [4 => 'swedish'], ]; var_dump(array_unique(array_merge(...$array)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/arFvf
function name:  (null)
number of ops:  12
compiled vars:  !0 = $array
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
   10     1        INIT_FCALL                                                   'var_dump'
          2        INIT_FCALL                                                   'array_unique'
          3        INIT_FCALL                                                   'array_merge'
          4        SEND_UNPACK                                                  !0
          5        CHECK_UNDEF_ARGS                                             
          6        DO_ICALL                                             $2      
          7        SEND_VAR                                                     $2
          8        DO_ICALL                                             $3      
          9        SEND_VAR                                                     $3
         10        DO_ICALL                                                     
         11      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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