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<?php var_dump( iconv_substr('20', 2, 1), substr('20', 2, 1), mb_substr('20', 2, 1) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qhP6H
function name:  (null)
number of ops:  18
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                                   'var_dump'
    4     1        INIT_FCALL_BY_NAME                                           'iconv_substr'
          2        SEND_VAL_EX                                                  '20'
          3        SEND_VAL_EX                                                  2
          4        SEND_VAL_EX                                                  1
          5        DO_FCALL                                          0  $0      
          6        SEND_VAR                                                     $0
    5     7        FRAMELESS_ICALL_3                substr              ~1      '20', 2
          8        OP_DATA                                                      1
          9        SEND_VAL                                                     ~1
    6    10        INIT_FCALL                                                   'mb_substr'
         11        SEND_VAL                                                     '20'
         12        SEND_VAL                                                     2
         13        SEND_VAL                                                     1
         14        DO_ICALL                                             $2      
         15        SEND_VAR                                                     $2
    3    16        DO_ICALL                                                     
    7    17      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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