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<?php mb_substitute_character(asc('?')); var_dump(mb_convert_encoding(chr(190), 'UTF-8', 'UTF-8'));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/Ms1LJ
function name:  (null)
number of ops:  18
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'mb_substitute_character'
         1        INIT_FCALL_BY_NAME                                       'asc'
         2        SEND_VAL_EX                                              '%3F'
         3        DO_FCALL                                      0  $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
   3     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL                                               'mb_convert_encoding'
         8        INIT_FCALL                                               'chr'
         9        SEND_VAL                                                 190
        10        DO_ICALL                                         $2      
        11        SEND_VAR                                                 $2
        12        SEND_VAL                                                 'UTF-8'
        13        SEND_VAL                                                 'UTF-8'
        14        DO_ICALL                                         $3      
        15        SEND_VAR                                                 $3
        16        DO_ICALL                                                 
        17      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0