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<?php $rest = substr("abcdef", 6, -2); $rest1 = substr("abcdef", 6, 4); var_dump($rest); var_dump($rest1);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rgStf
function name:  (null)
number of ops:  19
compiled vars:  !0 = $rest, !1 = $rest1
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'substr'
          1        SEND_VAL                                                 'abcdef'
          2        SEND_VAL                                                 6
          3        SEND_VAL                                                 -2
          4        DO_ICALL                                         $2      
          5        ASSIGN                                                   !0, $2
    4     6        INIT_FCALL                                               'substr'
          7        SEND_VAL                                                 'abcdef'
          8        SEND_VAL                                                 6
          9        SEND_VAL                                                 4
         10        DO_ICALL                                         $4      
         11        ASSIGN                                                   !1, $4
    5    12        INIT_FCALL                                               'var_dump'
         13        SEND_VAR                                                 !0
         14        DO_ICALL                                                 
    6    15        INIT_FCALL                                               'var_dump'
         16        SEND_VAR                                                 !1
         17        DO_ICALL                                                 
         18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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