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<?php var_dump(mb_detect_encoding('áéóú', null, false));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bCM7M
function name:  (null)
number of ops:  9
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'mb_detect_encoding'
          2        SEND_VAL                                                 '%C3%A1%C3%A9%C3%B3%C3%BA'
          3        SEND_VAL                                                 null
          4        SEND_VAL                                                 <false>
          5        DO_ICALL                                         $0      
          6        SEND_VAR                                                 $0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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