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run code in 300+ PHP versions simultaneously
<?php $foo = 'foo'; switch ($foo) { case 'foo': echo "first foo\n"; case 'bar': echo "bar, or fallthrough\n"; $foo = 'bar'; break; case 'foo': echo "second foo\n"; break; case 'bar': echo "second bar (unreachable)\n"; break; default: echo "default\n"; break; }
Finding entry points
Branch analysis from position: 0
4 jumps found. (Code = 188) Position 1 = 11, Position 2 = 12, Position 3 = 19, Position 4 = 2
Branch analysis from position: 11
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 12
Branch analysis from position: 19
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
Branch analysis from position: 2
2 jumps found. (Code = 44) Position 1 = 4, Position 2 = 11
Branch analysis from position: 4
2 jumps found. (Code = 44) Position 1 = 6, Position 2 = 12
Branch analysis from position: 6
2 jumps found. (Code = 44) Position 1 = 8, Position 2 = 15
Branch analysis from position: 8
2 jumps found. (Code = 44) Position 1 = 10, Position 2 = 17
Branch analysis from position: 10
1 jumps found. (Code = 42) Position 1 = 19
Branch analysis from position: 19
Branch analysis from position: 17
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
Branch analysis from position: 15
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
Branch analysis from position: 12
Branch analysis from position: 11
filename:       /in/i3746
function name:  (null)
number of ops:  22
compiled vars:  !0 = $foo
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'foo'
    3     1      > SWITCH_STRING                                            !0, [ 'foo':->11, 'bar':->12, ], ->19
    4     2    >   IS_EQUAL                                                 !0, 'foo'
          3      > JMPNZ                                                    ~2, ->11
    6     4    >   IS_EQUAL                                                 !0, 'bar'
          5      > JMPNZ                                                    ~2, ->12
   10     6    >   IS_EQUAL                                                 !0, 'foo'
          7      > JMPNZ                                                    ~2, ->15
   13     8    >   IS_EQUAL                                                 !0, 'bar'
          9      > JMPNZ                                                    ~2, ->17
         10    > > JMP                                                      ->19
    5    11    >   ECHO                                                     'first+foo%0A'
    7    12    >   ECHO                                                     'bar%2C+or+fallthrough%0A'
    8    13        ASSIGN                                                   !0, 'bar'
    9    14      > JMP                                                      ->21
   11    15    >   ECHO                                                     'second+foo%0A'
   12    16      > JMP                                                      ->21
   14    17    >   ECHO                                                     'second+bar+%28unreachable%29%0A'
   15    18      > JMP                                                      ->21
   17    19    >   ECHO                                                     'default%0A'
   18    20      > JMP                                                      ->21
   19    21    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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