3v4l.org

run code in 300+ PHP versions simultaneously
<?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: $obj = (object)array('123' => '456'); // property 123 is invalid print_r($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/Wk4Nf
function name:  (null)
number of ops:  58
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'
   10    23    >   FETCH_OBJ_R                                      ~11     !0, '123'
         24        ASSIGN_OBJ                                               !0, 'a123'
         25        OP_DATA                                                  ~11
   11    26        INIT_FCALL                                               'print_r'
         27        SEND_VAR                                                 !0
         28        DO_ICALL                                                 
   12    29        FETCH_OBJ_R                                      ~13     !0, 'a123'
         30        CONCAT                                           ~14     'Via+Property+a123%3A+', ~13
         31        ECHO                                                     ~14
         32        ECHO                                                     '%0A'
   15    33        FETCH_OBJ_R                                      ~17     !0, '123'
         34        FETCH_OBJ_W                                      $15     !0, 'a'
         35        ASSIGN_DIM                                               $15, 123
         36        OP_DATA                                                  ~17
   16    37        FETCH_OBJ_R                                      ~20     !0, 'a123'
         38        FETCH_OBJ_W                                      $18     !0, 'a'
         39        ASSIGN_DIM                                               $18, 'a123'
         40        OP_DATA                                                  ~20
   17    41        INIT_FCALL                                               'var_dump'
         42        SEND_VAR                                                 !0
         43        DO_ICALL                                                 
   18    44        FETCH_OBJ_R                                      ~22     !0, 'a'
         45        FETCH_DIM_R                                      ~23     ~22, 123
         46        CONCAT                                           ~24     'Via+Property+%22a%22+and+hashkey+%22123%22%3A+', ~23
         47        ECHO                                                     ~24
         48        ECHO                                                     '%0A'
   21    49        CAST                                          8  ~25     <array>
         50        ASSIGN                                                   !0, ~25
   22    51        INIT_FCALL                                               'print_r'
         52        SEND_VAR                                                 !0
         53        DO_ICALL                                                 
   23    54        FETCH_OBJ_R                                      ~28     !0, '123'
         55        ECHO                                                     ~28
         56        ECHO                                                     '%0A'
         57      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
171.81 ms | 1400 KiB | 19 Q