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<?php class C { function __get($key) {return ($key === 'x') ? 'x' : '';} function __isset($key) {return $key === 'x' || $key === 'y';} } $c = new C; var_export(empty($c->x)); var_export(empty($c->y)); var_export(empty($c->other));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fVcL2
function name:  (null)
number of ops:  16
compiled vars:  !0 = $c
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   NEW                                              $1      'C'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    8     3        INIT_FCALL                                               'var_export'
          4        ISSET_ISEMPTY_PROP_OBJ                           ~4      !0, 'x'
          5        SEND_VAL                                                 ~4
          6        DO_ICALL                                                 
    9     7        INIT_FCALL                                               'var_export'
          8        ISSET_ISEMPTY_PROP_OBJ                           ~6      !0, 'y'
          9        SEND_VAL                                                 ~6
         10        DO_ICALL                                                 
   10    11        INIT_FCALL                                               'var_export'
         12        ISSET_ISEMPTY_PROP_OBJ                           ~8      !0, 'other'
         13        SEND_VAL                                                 ~8
         14        DO_ICALL                                                 
         15      > RETURN                                                   1

Class C:
Function __get:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 5
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fVcL2
function name:  __get
number of ops:  8
compiled vars:  !0 = $key
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        IS_IDENTICAL                                             !0, 'x'
          2      > JMPZ                                                     ~1, ->5
          3    >   QM_ASSIGN                                        ~2      'x'
          4      > JMP                                                      ->6
          5    >   QM_ASSIGN                                        ~2      ''
          6    > > RETURN                                                   ~2
          7*     > RETURN                                                   null

End of function __get

Function __isset:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 47) Position 1 = 3, Position 2 = 5
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 5
filename:       /in/fVcL2
function name:  __isset
number of ops:  7
compiled vars:  !0 = $key
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   RECV                                             !0      
          1        IS_IDENTICAL                                     ~1      !0, 'x'
          2      > JMPNZ_EX                                         ~1      ~1, ->5
          3    >   IS_IDENTICAL                                     ~2      !0, 'y'
          4        BOOL                                             ~1      ~2
          5    > > RETURN                                                   ~1
          6*     > RETURN                                                   null

End of function __isset

End of class C.

Generated using Vulcan Logic Dumper, using php 8.0.0


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