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<?php mb_substitute_character(0xfffd); var_dump(bin2hex(mb_convert_encoding("A\xc0\x80B", 'UTF-16', 'UTF-8')));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/KVuOS
function name:  (null)
number of ops:  15
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'mb_substitute_character'
          1        SEND_VAL                                                 65533
          2        DO_ICALL                                                 
    3     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'bin2hex'
          5        INIT_FCALL                                               'mb_convert_encoding'
          6        SEND_VAL                                                 'A%C0%80B'
          7        SEND_VAL                                                 'UTF-16'
          8        SEND_VAL                                                 'UTF-8'
          9        DO_ICALL                                         $1      
         10        SEND_VAR                                                 $1
         11        DO_ICALL                                         $2      
         12        SEND_VAR                                                 $2
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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