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<?php $fields = ['delete' => [], 'update' => []]; print_r(call_user_func_array('array_merge', array_values($fields)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/AukS9
function name:  (null)
number of ops:  12
compiled vars:  !0 = $fields
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'print_r'
          2        INIT_FCALL                                               'array_merge'
          3        INIT_FCALL                                               'array_values'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        SEND_ARRAY                                               $2
          7        CHECK_UNDEF_ARGS                                         
          8        DO_FCALL                                      0  $3      
          9        SEND_VAR                                                 $3
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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