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<?php echo "\n#1: hello\n"; $a = 'hello'; var_dump($a['test']); // notice, but fetches the first char 'h' (undefined/null = 0) var_dump($a[false]); // notice, but fetches the first char 'h' (false = 0) var_dump($a[true]); // notice, but fetches the second char 'e' (true = 1) var_dump($a['2']); // notice, but fetches the second char 'e' (true = 1) echo "\n#2: 42\n"; $a = 42; var_dump($a['test']); // NO NOTICE, returns null var_dump($a[1]); // NO NOTICE, returns null var_dump($a[2]); // NO NOTICE, returns null echo "\n#2: null\n"; $a = null; var_dump($a['test']); // NO NOTICE, returns null var_dump($a[1]); // NO NOTICE, returns null var_dump($a[2]); // NO NOTICE, returns null echo "\nHave fun with it...\nbest regards,\nyour PHP";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/XVA87
function name:  (null)
number of ops:  48
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ECHO                                                     '%0A%231%3A+hello%0A'
    3     1        ASSIGN                                                   !0, 'hello'
    4     2        INIT_FCALL                                               'var_dump'
          3        FETCH_DIM_R                                      ~2      !0, 'test'
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
    5     6        INIT_FCALL                                               'var_dump'
          7        FETCH_DIM_R                                      ~4      !0, <false>
          8        SEND_VAL                                                 ~4
          9        DO_ICALL                                                 
    6    10        INIT_FCALL                                               'var_dump'
         11        FETCH_DIM_R                                      ~6      !0, <true>
         12        SEND_VAL                                                 ~6
         13        DO_ICALL                                                 
    7    14        INIT_FCALL                                               'var_dump'
         15        FETCH_DIM_R                                      ~8      !0, 2
         16        SEND_VAL                                                 ~8
         17        DO_ICALL                                                 
    9    18        ECHO                                                     '%0A%232%3A+42%0A'
   10    19        ASSIGN                                                   !0, 42
   11    20        INIT_FCALL                                               'var_dump'
         21        FETCH_DIM_R                                      ~11     !0, 'test'
         22        SEND_VAL                                                 ~11
         23        DO_ICALL                                                 
   12    24        INIT_FCALL                                               'var_dump'
         25        FETCH_DIM_R                                      ~13     !0, 1
         26        SEND_VAL                                                 ~13
         27        DO_ICALL                                                 
   13    28        INIT_FCALL                                               'var_dump'
         29        FETCH_DIM_R                                      ~15     !0, 2
         30        SEND_VAL                                                 ~15
         31        DO_ICALL                                                 
   15    32        ECHO                                                     '%0A%232%3A+null%0A'
   16    33        ASSIGN                                                   !0, null
   17    34        INIT_FCALL                                               'var_dump'
         35        FETCH_DIM_R                                      ~18     !0, 'test'
         36        SEND_VAL                                                 ~18
         37        DO_ICALL                                                 
   18    38        INIT_FCALL                                               'var_dump'
         39        FETCH_DIM_R                                      ~20     !0, 1
         40        SEND_VAL                                                 ~20
         41        DO_ICALL                                                 
   19    42        INIT_FCALL                                               'var_dump'
         43        FETCH_DIM_R                                      ~22     !0, 2
         44        SEND_VAL                                                 ~22
         45        DO_ICALL                                                 
   21    46        ECHO                                                     '%0AHave+fun+with+it...%0Abest+regards%2C%0Ayour+PHP'
         47      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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