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<?php function sub_string($pattern, $subject) { $n = strlen($subject); $m = strlen($pattern); for ($i = 0; $i < $n-$m; $i++) { $j = 0; while ($j < $m && $subject[$i+$j] == $pattern[$j]) { $j++; } if ($j == $m){ return 1; }else{ return 0; } } } echo sub_string("hel", "hello");
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/oKmfj
function name:  (null)
number of ops:  6
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   18     0  E >   INIT_FCALL                                               'sub_string'
          1        SEND_VAL                                                 'hel'
          2        SEND_VAL                                                 'hello'
          3        DO_FCALL                                      0  $0      
          4        ECHO                                                     $0
          5      > RETURN                                                   1

Function sub_string:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 25
Branch analysis from position: 25
2 jumps found. (Code = 44) Position 1 = 28, Position 2 = 8
Branch analysis from position: 28
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
1 jumps found. (Code = 42) Position 1 = 11
Branch analysis from position: 11
2 jumps found. (Code = 46) Position 1 = 13, Position 2 = 18
Branch analysis from position: 13
2 jumps found. (Code = 44) Position 1 = 19, Position 2 = 10
Branch analysis from position: 19
2 jumps found. (Code = 43) Position 1 = 21, Position 2 = 23
Branch analysis from position: 21
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 23
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
2 jumps found. (Code = 46) Position 1 = 13, Position 2 = 18
Branch analysis from position: 13
Branch analysis from position: 18
Branch analysis from position: 18
filename:       /in/oKmfj
function name:  sub_string
number of ops:  29
compiled vars:  !0 = $pattern, !1 = $subject, !2 = $n, !3 = $m, !4 = $i, !5 = $j
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    4     2        STRLEN                                           ~6      !1
          3        ASSIGN                                                   !2, ~6
    5     4        STRLEN                                           ~8      !0
          5        ASSIGN                                                   !3, ~8
    7     6        ASSIGN                                                   !4, 0
          7      > JMP                                                      ->25
    8     8    >   ASSIGN                                                   !5, 0
    9     9      > JMP                                                      ->11
   10    10    >   PRE_INC                                                  !5
    9    11    >   IS_SMALLER                                       ~13     !5, !3
         12      > JMPZ_EX                                          ~13     ~13, ->18
         13    >   ADD                                              ~14     !4, !5
         14        FETCH_DIM_R                                      ~15     !1, ~14
         15        FETCH_DIM_R                                      ~16     !0, !5
         16        IS_EQUAL                                         ~17     ~15, ~16
         17        BOOL                                             ~13     ~17
         18    > > JMPNZ                                                    ~13, ->10
   12    19    >   IS_EQUAL                                                 !5, !3
         20      > JMPZ                                                     ~18, ->23
         21    > > RETURN                                                   1
         22*       JMP                                                      ->24
   13    23    > > RETURN                                                   0
    7    24*       PRE_INC                                                  !4
         25    >   SUB                                              ~20     !2, !3
         26        IS_SMALLER                                               !4, ~20
         27      > JMPNZ                                                    ~21, ->8
   16    28    > > RETURN                                                   null

End of function sub_string

Generated using Vulcan Logic Dumper, using php 8.0.0


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