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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";} // 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: $obj = (object)array('123' => '456'); // property 123 is invalid print_r($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
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 16
filename:       /in/8D2aO
function name:  (null)
number of ops:  51
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'
    9    16    >   FETCH_OBJ_R                                      ~10     !0, '123'
         17        ASSIGN_OBJ                                               !0, 'a123'
         18        OP_DATA                                                  ~10
   10    19        INIT_FCALL                                               'print_r'
         20        SEND_VAR                                                 !0
         21        DO_ICALL                                                 
   11    22        FETCH_OBJ_R                                      ~12     !0, 'a123'
         23        CONCAT                                           ~13     'Via+Property+a123%3A+', ~12
         24        ECHO                                                     ~13
         25        ECHO                                                     '%0A'
   14    26        FETCH_OBJ_R                                      ~16     !0, '123'
         27        FETCH_OBJ_W                                      $14     !0, 'a'
         28        ASSIGN_DIM                                               $14, 123
         29        OP_DATA                                                  ~16
   15    30        FETCH_OBJ_R                                      ~19     !0, 'a123'
         31        FETCH_OBJ_W                                      $17     !0, 'a'
         32        ASSIGN_DIM                                               $17, 'a123'
         33        OP_DATA                                                  ~19
   16    34        INIT_FCALL                                               'var_dump'
         35        SEND_VAR                                                 !0
         36        DO_ICALL                                                 
   17    37        FETCH_OBJ_R                                      ~21     !0, 'a'
         38        FETCH_DIM_R                                      ~22     ~21, 123
         39        CONCAT                                           ~23     'Via+Property+%22a%22+and+hashkey+%22123%22%3A+', ~22
         40        ECHO                                                     ~23
         41        ECHO                                                     '%0A'
   20    42        CAST                                          8  ~24     <array>
         43        ASSIGN                                                   !0, ~24
   21    44        INIT_FCALL                                               'print_r'
         45        SEND_VAR                                                 !0
         46        DO_ICALL                                                 
   22    47        FETCH_OBJ_R                                      ~27     !0, '123'
         48        ECHO                                                     ~27
         49        ECHO                                                     '%0A'
         50      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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