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<?php /* Default from the book */ $a = range(3,9); foreach ($a as $b) { switch($b) { case 3: $b = 7; case 7: $b = 3; default: // do nothing } } echo implode('-',$a) . PHP_EOL; // Excerpt From: Lorna Mitchell. “Zend Certification Preparation Pack.” iBooks. /* Suggested alternate method from the book */ $a = range(3,9); foreach ($a as $key => $b) { switch($b) { case 3: $a[$key] = 7; case 7: $a[$key] = 3; default: // do nothing } } echo implode('-',$a) - PHP_EOL; /* Second alternate by using $b by reference */ $a = range(3,9); foreach ($a as &$b) { switch($b) { case 3: $b = 7; case 7: $b = 3; default: // do nothing } } echo implode('-',$a);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 6, Position 2 = 15
Branch analysis from position: 6
2 jumps found. (Code = 78) Position 1 = 7, Position 2 = 15
Branch analysis from position: 7
2 jumps found. (Code = 44) Position 1 = 9, Position 2 = 12
Branch analysis from position: 9
2 jumps found. (Code = 44) Position 1 = 11, Position 2 = 13
Branch analysis from position: 11
1 jumps found. (Code = 42) Position 1 = 14
Branch analysis from position: 14
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
Branch analysis from position: 13
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
Branch analysis from position: 12
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
Branch analysis from position: 15
2 jumps found. (Code = 77) Position 1 = 28, Position 2 = 40
Branch analysis from position: 28
2 jumps found. (Code = 78) Position 1 = 29, Position 2 = 40
Branch analysis from position: 29
2 jumps found. (Code = 44) Position 1 = 32, Position 2 = 35
Branch analysis from position: 32
2 jumps found. (Code = 44) Position 1 = 34, Position 2 = 37
Branch analysis from position: 34
1 jumps found. (Code = 42) Position 1 = 39
Branch analysis from position: 39
1 jumps found. (Code = 42) Position 1 = 28
Branch analysis from position: 28
Branch analysis from position: 37
1 jumps found. (Code = 42) Position 1 = 28
Branch analysis from position: 28
Branch analysis from position: 35
1 jumps found. (Code = 42) Position 1 = 28
Branch analysis from position: 28
Branch analysis from position: 40
2 jumps found. (Code = 125) Position 1 = 53, Position 2 = 62
Branch analysis from position: 53
2 jumps found. (Code = 126) Position 1 = 54, Position 2 = 62
Branch analysis from position: 54
2 jumps found. (Code = 44) Position 1 = 56, Position 2 = 59
Branch analysis from position: 56
2 jumps found. (Code = 44) Position 1 = 58, Position 2 = 60
Branch analysis from position: 58
1 jumps found. (Code = 42) Position 1 = 61
Branch analysis from position: 61
1 jumps found. (Code = 42) Position 1 = 53
Branch analysis from position: 53
Branch analysis from position: 60
1 jumps found. (Code = 42) Position 1 = 53
Branch analysis from position: 53
Branch analysis from position: 59
1 jumps found. (Code = 42) Position 1 = 53
Branch analysis from position: 53
Branch analysis from position: 62
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 62
Branch analysis from position: 40
Branch analysis from position: 15
filename:       /in/DddcB
function name:  (null)
number of ops:  69
compiled vars:  !0 = $a, !1 = $b, !2 = $key
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   INIT_FCALL                                               'range'
          1        SEND_VAL                                                 3
          2        SEND_VAL                                                 9
          3        DO_ICALL                                         $3      
          4        ASSIGN                                                   !0, $3
    7     5      > FE_RESET_R                                       $5      !0, ->15
          6    > > FE_FETCH_R                                               $5, !1, ->15
    9     7    >   IS_EQUAL                                                 !1, 3
          8      > JMPNZ                                                    ~6, ->12
   11     9    >   IS_EQUAL                                                 !1, 7
         10      > JMPNZ                                                    ~6, ->13
         11    > > JMP                                                      ->14
   10    12    >   ASSIGN                                                   !1, 7
   12    13    >   ASSIGN                                                   !1, 3
    7    14    > > JMP                                                      ->6
         15    >   FE_FREE                                                  $5
   17    16        INIT_FCALL                                               'implode'
         17        SEND_VAL                                                 '-'
         18        SEND_VAR                                                 !0
         19        DO_ICALL                                         $9      
         20        CONCAT                                           ~10     $9, '%0A'
         21        ECHO                                                     ~10
   24    22        INIT_FCALL                                               'range'
         23        SEND_VAL                                                 3
         24        SEND_VAL                                                 9
         25        DO_ICALL                                         $11     
         26        ASSIGN                                                   !0, $11
   25    27      > FE_RESET_R                                       $13     !0, ->40
         28    > > FE_FETCH_R                                       ~14     $13, !1, ->40
         29    >   ASSIGN                                                   !2, ~14
   27    30        IS_EQUAL                                                 !1, 3
         31      > JMPNZ                                                    ~16, ->35
   29    32    >   IS_EQUAL                                                 !1, 7
         33      > JMPNZ                                                    ~16, ->37
         34    > > JMP                                                      ->39
   28    35    >   ASSIGN_DIM                                               !0, !2
         36        OP_DATA                                                  7
   30    37    >   ASSIGN_DIM                                               !0, !2
         38        OP_DATA                                                  3
   25    39    > > JMP                                                      ->28
         40    >   FE_FREE                                                  $13
   35    41        INIT_FCALL                                               'implode'
         42        SEND_VAL                                                 '-'
         43        SEND_VAR                                                 !0
         44        DO_ICALL                                         $19     
         45        SUB                                              ~20     $19, '%0A'
         46        ECHO                                                     ~20
   40    47        INIT_FCALL                                               'range'
         48        SEND_VAL                                                 3
         49        SEND_VAL                                                 9
         50        DO_ICALL                                         $21     
         51        ASSIGN                                                   !0, $21
   41    52      > FE_RESET_RW                                      $23     !0, ->62
         53    > > FE_FETCH_RW                                              $23, !1, ->62
   43    54    >   IS_EQUAL                                                 !1, 3
         55      > JMPNZ                                                    ~24, ->59
   45    56    >   IS_EQUAL                                                 !1, 7
         57      > JMPNZ                                                    ~24, ->60
         58    > > JMP                                                      ->61
   44    59    >   ASSIGN                                                   !1, 7
   46    60    >   ASSIGN                                                   !1, 3
   41    61    > > JMP                                                      ->53
         62    >   FE_FREE                                                  $23
   51    63        INIT_FCALL                                               'implode'
         64        SEND_VAL                                                 '-'
         65        SEND_VAR                                                 !0
         66        DO_ICALL                                         $27     
         67        ECHO                                                     $27
         68      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
175.78 ms | 1404 KiB | 17 Q