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<?php declare(strict_types=1); class Foo { private array $data = []; public function __set(string $name, $value): void { $this->data[$name] = $value; } public function __isset(string $name): bool { return isset($this->data[$name]); } public function __unset(string $name): void { unset($this->data[$name]); } } $foo = new Foo(); $foo->{1} = 'one'; $foo->{2} = 'two'; var_dump( isset($foo->{1}), // true isset($foo->{2}) // true ); unset($foo->{1}); var_dump( isset($foo->{1}) // false );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0k4LS
function name:  (null)
number of ops:  19
compiled vars:  !0 = $foo
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   23     0  E >   NEW                                                  $1      'Foo'
          1        DO_FCALL                                          0          
          2        ASSIGN                                                       !0, $1
   25     3        ASSIGN_OBJ                                                   !0, '1'
          4        OP_DATA                                                      'one'
   26     5        ASSIGN_OBJ                                                   !0, '2'
          6        OP_DATA                                                      'two'
   28     7        INIT_FCALL                                                   'var_dump'
   29     8        ISSET_ISEMPTY_PROP_OBJ                               ~6      !0, '1'
          9        SEND_VAL                                                     ~6
   30    10        ISSET_ISEMPTY_PROP_OBJ                               ~7      !0, '2'
         11        SEND_VAL                                                     ~7
   28    12        DO_ICALL                                                     
   33    13        UNSET_OBJ                                                    !0, '1'
   35    14        INIT_FCALL                                                   'var_dump'
   36    15        ISSET_ISEMPTY_PROP_OBJ                               ~9      !0, '1'
         16        SEND_VAL                                                     ~9
   35    17        DO_ICALL                                                     
   37    18      > RETURN                                                       1

Class Foo:
Function __set:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0k4LS
function name:  __set
number of ops:  6
compiled vars:  !0 = $name, !1 = $value
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    7     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
    9     2        FETCH_OBJ_W                                          $2      'data'
          3        ASSIGN_DIM                                                   $2, !0
          4        OP_DATA                                                      !1
   10     5      > RETURN                                                       null

End of function __set

Function __isset:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0k4LS
function name:  __isset
number of ops:  7
compiled vars:  !0 = $name
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   12     0  E >   RECV                                                 !0      
   14     1        FETCH_OBJ_IS                                         ~1      'data'
          2        ISSET_ISEMPTY_DIM_OBJ                             0  ~2      ~1, !0
          3        VERIFY_RETURN_TYPE                                           ~2
          4      > RETURN                                                       ~2
   15     5*       VERIFY_RETURN_TYPE                                           
          6*     > RETURN                                                       null

End of function __isset

Function __unset:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0k4LS
function name:  __unset
number of ops:  4
compiled vars:  !0 = $name
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   17     0  E >   RECV                                                 !0      
   19     1        FETCH_OBJ_UNSET                                      $1      'data'
          2        UNSET_DIM                                                    $1, !0
   20     3      > RETURN                                                       null

End of function __unset

End of class Foo.

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