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<?php $obj = new stdClass; $obj->{'123'} = '456'; // defined property but unusable as obj->property; see below. print_r($obj); echo 'Via {\'123\'}: ' . $obj->{'123'},"\n"; if (isset($obj->{'123'})) { echo '123 is set',"\n";} if (property_exists($obj,'123')) echo 'property 123 exists',"\n"; echo $obj->{'123'}; // Parse error: ...unexpected '123' (T_LNUMBER), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' $obj->{'a123'} = $obj->{'123'}; print_r($obj); echo 'Via Property a123: ' . $obj->a123,"\n"; // making a hash out of property a $obj->a["123"] = $obj->{'123'}; $obj->a["a123"] = $obj->{'a123'}; var_dump($obj); echo 'Via Property "a" and hashkey "123": ' . $obj->a["123"],"\n"; // contrast: $obj = (object)array((string)'123' => '456'); // property 123 is invalid print_r($obj); echo $obj->{'123'},"\n"; // so "Undefined property: stdClass::$123"
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 14, Position 2 = 16
Branch analysis from position: 14
2 jumps found. (Code = 43) Position 1 = 21, Position 2 = 23
Branch analysis from position: 21
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 23
Branch analysis from position: 16
filename:       /in/ncPAP
function name:  (null)
number of ops:  62
compiled vars:  !0 = $obj
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   NEW                                              $1      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    3     3        ASSIGN_OBJ                                               !0, '123'
          4        OP_DATA                                                  '456'
    4     5        INIT_FCALL                                               'print_r'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
    5     8        FETCH_OBJ_R                                      ~6      !0, '123'
          9        CONCAT                                           ~7      'Via+%7B%27123%27%7D%3A+', ~6
         10        ECHO                                                     ~7
         11        ECHO                                                     '%0A'
    6    12        ISSET_ISEMPTY_PROP_OBJ                                   !0, '123'
         13      > JMPZ                                                     ~8, ->16
         14    >   ECHO                                                     '123+is+set'
         15        ECHO                                                     '%0A'
    7    16    >   INIT_FCALL                                               'property_exists'
         17        SEND_VAR                                                 !0
         18        SEND_VAL                                                 '123'
         19        DO_ICALL                                         $9      
         20      > JMPZ                                                     $9, ->23
         21    >   ECHO                                                     'property+123+exists'
         22        ECHO                                                     '%0A'
    8    23    >   FETCH_OBJ_R                                      ~10     !0, '123'
         24        ECHO                                                     ~10
   10    25        FETCH_OBJ_R                                      ~12     !0, '123'
         26        ASSIGN_OBJ                                               !0, 'a123'
         27        OP_DATA                                                  ~12
   11    28        INIT_FCALL                                               'print_r'
         29        SEND_VAR                                                 !0
         30        DO_ICALL                                                 
   12    31        FETCH_OBJ_R                                      ~14     !0, 'a123'
         32        CONCAT                                           ~15     'Via+Property+a123%3A+', ~14
         33        ECHO                                                     ~15
         34        ECHO                                                     '%0A'
   15    35        FETCH_OBJ_R                                      ~18     !0, '123'
         36        FETCH_OBJ_W                                      $16     !0, 'a'
         37        ASSIGN_DIM                                               $16, 123
         38        OP_DATA                                                  ~18
   16    39        FETCH_OBJ_R                                      ~21     !0, 'a123'
         40        FETCH_OBJ_W                                      $19     !0, 'a'
         41        ASSIGN_DIM                                               $19, 'a123'
         42        OP_DATA                                                  ~21
   17    43        INIT_FCALL                                               'var_dump'
         44        SEND_VAR                                                 !0
         45        DO_ICALL                                                 
   18    46        FETCH_OBJ_R                                      ~23     !0, 'a'
         47        FETCH_DIM_R                                      ~24     ~23, 123
         48        CONCAT                                           ~25     'Via+Property+%22a%22+and+hashkey+%22123%22%3A+', ~24
         49        ECHO                                                     ~25
         50        ECHO                                                     '%0A'
   21    51        CAST                                          6  ~26     '123'
         52        INIT_ARRAY                                       ~27     '456', ~26
         53        CAST                                          8  ~28     ~27
         54        ASSIGN                                                   !0, ~28
   22    55        INIT_FCALL                                               'print_r'
         56        SEND_VAR                                                 !0
         57        DO_ICALL                                                 
   23    58        FETCH_OBJ_R                                      ~31     !0, '123'
         59        ECHO                                                     ~31
         60        ECHO                                                     '%0A'
         61      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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