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<?php var_dump(iconv_substr('',0,10,'utf-8')); var_dump(substr('',0,10)); var_dump(mb_substr('',0,10));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Q52RB
function name:  (null)
number of ops:  26
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL_BY_NAME                                       'iconv_substr'
          2        SEND_VAL_EX                                              ''
          3        SEND_VAL_EX                                              0
          4        SEND_VAL_EX                                              10
          5        SEND_VAL_EX                                              'utf-8'
          6        DO_FCALL                                      0  $0      
          7        SEND_VAR                                                 $0
          8        DO_ICALL                                                 
    4     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'substr'
         11        SEND_VAL                                                 ''
         12        SEND_VAL                                                 0
         13        SEND_VAL                                                 10
         14        DO_ICALL                                         $2      
         15        SEND_VAR                                                 $2
         16        DO_ICALL                                                 
    5    17        INIT_FCALL                                               'var_dump'
         18        INIT_FCALL                                               'mb_substr'
         19        SEND_VAL                                                 ''
         20        SEND_VAL                                                 0
         21        SEND_VAL                                                 10
         22        DO_ICALL                                         $4      
         23        SEND_VAR                                                 $4
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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