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<?php $string = "Zo\u{00EB}"; var_dump($string); echo "\n"; var_dump(substr($string, -1)); var_dump(mb_substr($string, -1)); var_dump(iconv_substr($string, -1)); var_dump(grapheme_substr($string, -1));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/pAvB0
function name:  (null)
number of ops:  34
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'Zo%C3%AB'
    5     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    6     4        ECHO                                                     '%0A'
    7     5        INIT_FCALL                                               'var_dump'
          6        INIT_FCALL                                               'substr'
          7        SEND_VAR                                                 !0
          8        SEND_VAL                                                 -1
          9        DO_ICALL                                         $3      
         10        SEND_VAR                                                 $3
         11        DO_ICALL                                                 
    8    12        INIT_FCALL                                               'var_dump'
         13        INIT_FCALL                                               'mb_substr'
         14        SEND_VAR                                                 !0
         15        SEND_VAL                                                 -1
         16        DO_ICALL                                         $5      
         17        SEND_VAR                                                 $5
         18        DO_ICALL                                                 
    9    19        INIT_FCALL                                               'var_dump'
         20        INIT_FCALL_BY_NAME                                       'iconv_substr'
         21        SEND_VAR_EX                                              !0
         22        SEND_VAL_EX                                              -1
         23        DO_FCALL                                      0  $7      
         24        SEND_VAR                                                 $7
         25        DO_ICALL                                                 
   10    26        INIT_FCALL                                               'var_dump'
         27        INIT_FCALL_BY_NAME                                       'grapheme_substr'
         28        SEND_VAR_EX                                              !0
         29        SEND_VAL_EX                                              -1
         30        DO_FCALL                                      0  $9      
         31        SEND_VAR                                                 $9
         32        DO_ICALL                                                 
         33      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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