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<?php var_dump(array_merge([1 => 'a', 3 => 'b'], [2 => 'c', 3 => 'd'])); var_dump(array_merge([1 => 'a', 3 => 'b'], [2 => 'c', 5 => 'd']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/JiQqk
function name:  (null)
number of ops:  15
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'array_merge'
         2        SEND_VAL                                                 <array>
         3        SEND_VAL                                                 <array>
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
   4     7        INIT_FCALL                                               'var_dump'
         8        INIT_FCALL                                               'array_merge'
         9        SEND_VAL                                                 <array>
        10        SEND_VAL                                                 <array>
        11        DO_ICALL                                         $2      
        12        SEND_VAR                                                 $2
        13        DO_ICALL                                                 
        14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0