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<?php function doit($v) { var_dump($v); switch ($v) { case 0: echo "zero"; break; case null: echo "null"; break; case false: echo "false"; break; case '': echo "''"; break; } echo "\n\n"; } foreach (array(0, null, false, '') as $v) doit($v);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 1, Position 2 = 6
Branch analysis from position: 1
2 jumps found. (Code = 78) Position 1 = 2, Position 2 = 6
Branch analysis from position: 2
1 jumps found. (Code = 42) Position 1 = 1
Branch analysis from position: 1
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
filename:       /in/eUpWP
function name:  (null)
number of ops:  8
compiled vars:  !0 = $v
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E > > FE_RESET_R                                       $1      <array>, ->6
          1    > > FE_FETCH_R                                               $1, !0, ->6
          2    >   INIT_FCALL                                               'doit'
          3        SEND_VAR                                                 !0
          4        DO_FCALL                                      0          
          5      > JMP                                                      ->1
          6    >   FE_FREE                                                  $1
          7      > RETURN                                                   1

Function doit:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 44) Position 1 = 6, Position 2 = 13
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
2 jumps found. (Code = 44) Position 1 = 12, Position 2 = 19
Branch analysis from position: 12
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: 19
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
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: 13
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
filename:       /in/eUpWP
function name:  doit
number of ops:  23
compiled vars:  !0 = $v
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    6     4        IS_EQUAL                                                 !0, 0
          5      > JMPNZ                                                    ~2, ->13
    5     6    >   IS_EQUAL                                                 !0, null
          7      > JMPNZ                                                    ~2, ->15
    8     8    >   IS_EQUAL                                                 !0, <false>
          9      > JMPNZ                                                    ~2, ->17
    9    10    >   IS_EQUAL                                                 !0, ''
         11      > JMPNZ                                                    ~2, ->19
         12    > > JMP                                                      ->21
    6    13    >   ECHO                                                     'zero'
         14      > JMP                                                      ->21
    7    15    >   ECHO                                                     'null'
         16      > JMP                                                      ->21
    8    17    >   ECHO                                                     'false'
         18      > JMP                                                      ->21
    9    19    >   ECHO                                                     '%27%27'
         20      > JMP                                                      ->21
   11    21    >   ECHO                                                     '%0A%0A'
   12    22      > RETURN                                                   null

End of function doit

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