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<?php function foo($a) { $page1 = isset($a['page']) ? $a['page'] : 1; echo 'P1: ', $page1, "\n"; $page2 = $a['page'] ?? 1; echo 'P2: ', $page2, "\n"; $page3 = array_key_exists('page', $_GET) ? $_GET['page'] : 1; echo 'P3: ', $page3, "\n"; echo ($page1 === $page2) === $page3 ? 't' : 'n', "\n"; } $a = array('page' => 3); foo($a); $a = array(); foo($a); $a = array('page' => Null); foo($a); $a = array('page' => 0); foo($a); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ta5m4
function name:  (null)
number of ops:  17
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   18     0  E >   ASSIGN                                                   !0, <array>
   19     1        INIT_FCALL                                               'foo'
          2        SEND_VAR                                                 !0
          3        DO_FCALL                                      0          
   20     4        ASSIGN                                                   !0, <array>
   21     5        INIT_FCALL                                               'foo'
          6        SEND_VAR                                                 !0
          7        DO_FCALL                                      0          
   23     8        ASSIGN                                                   !0, <array>
   24     9        INIT_FCALL                                               'foo'
         10        SEND_VAR                                                 !0
         11        DO_FCALL                                      0          
   26    12        ASSIGN                                                   !0, <array>
   27    13        INIT_FCALL                                               'foo'
         14        SEND_VAR                                                 !0
         15        DO_FCALL                                      0          
   29    16      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 6
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 7
Branch analysis from position: 7
2 jumps found. (Code = 43) Position 1 = 21, Position 2 = 25
Branch analysis from position: 21
1 jumps found. (Code = 42) Position 1 = 26
Branch analysis from position: 26
2 jumps found. (Code = 43) Position 1 = 33, Position 2 = 35
Branch analysis from position: 33
1 jumps found. (Code = 42) Position 1 = 36
Branch analysis from position: 36
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 35
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 25
2 jumps found. (Code = 43) Position 1 = 33, Position 2 = 35
Branch analysis from position: 33
Branch analysis from position: 35
Branch analysis from position: 6
2 jumps found. (Code = 43) Position 1 = 21, Position 2 = 25
Branch analysis from position: 21
Branch analysis from position: 25
filename:       /in/ta5m4
function name:  foo
number of ops:  39
compiled vars:  !0 = $a, !1 = $page1, !2 = $page2, !3 = $page3
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV                                             !0      
    4     1        ISSET_ISEMPTY_DIM_OBJ                         0          !0, 'page'
          2      > JMPZ                                                     ~4, ->6
          3    >   FETCH_DIM_R                                      ~5      !0, 'page'
          4        QM_ASSIGN                                        ~6      ~5
          5      > JMP                                                      ->7
          6    >   QM_ASSIGN                                        ~6      1
          7    >   ASSIGN                                                   !1, ~6
    6     8        ECHO                                                     'P1%3A+'
          9        ECHO                                                     !1
         10        ECHO                                                     '%0A'
    8    11        FETCH_DIM_IS                                     ~8      !0, 'page'
         12        COALESCE                                         ~9      ~8
         13        QM_ASSIGN                                        ~9      1
         14        ASSIGN                                                   !2, ~9
   10    15        ECHO                                                     'P2%3A+'
         16        ECHO                                                     !2
         17        ECHO                                                     '%0A'
   12    18        FETCH_R                      global              ~11     '_GET'
         19        ARRAY_KEY_EXISTS                                         'page', ~11
         20      > JMPZ                                                     ~12, ->25
         21    >   FETCH_R                      global              ~13     '_GET'
         22        FETCH_DIM_R                                      ~14     ~13, 'page'
         23        QM_ASSIGN                                        ~15     ~14
         24      > JMP                                                      ->26
         25    >   QM_ASSIGN                                        ~15     1
         26    >   ASSIGN                                                   !3, ~15
   13    27        ECHO                                                     'P3%3A+'
         28        ECHO                                                     !3
         29        ECHO                                                     '%0A'
   15    30        IS_IDENTICAL                                     ~17     !1, !2
         31        IS_IDENTICAL                                             !3, ~17
         32      > JMPZ                                                     ~18, ->35
         33    >   QM_ASSIGN                                        ~19     't'
         34      > JMP                                                      ->36
         35    >   QM_ASSIGN                                        ~19     'n'
         36    >   ECHO                                                     ~19
         37        ECHO                                                     '%0A'
   16    38      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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