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<?php /** * @property stdClass $x * @property stdClass $y */ class C { private $buffer = array(); function __get($key) { if (array_key_exists($key, $this->buffer)) { return $this->buffer[$key]; } $f = 'calc_' . $key; return $this->buffer[$key] = $this->$f(); } function calc_x() {print __METHOD__ . "\n"; $x = new stdClass; $x->y = $this->__get('y'); return $x; } function calc_y() {print __METHOD__ . "\n"; $y = new stdClass; // Set a stub to avoid infinite recursion. $this->buffer['y'] = $y; $y->x = $this->__get('x'); return $y; } } $c = new C; $x = $c->x; $y = $c->y; var_dump($x->y === $y, $y->x === $x); print "\n"; $c = new C; $y = $c->y; $x = $c->x; var_dump($x->y === $y, $y->x === $x);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Nb3VF
function name:  (null)
number of ops:  32
compiled vars:  !0 = $c, !1 = $x, !2 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   33     0  E >   NEW                                              $3      'C'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $3
   34     3        FETCH_OBJ_R                                      ~6      !0, 'x'
          4        ASSIGN                                                   !1, ~6
   35     5        FETCH_OBJ_R                                      ~8      !0, 'y'
          6        ASSIGN                                                   !2, ~8
   36     7        INIT_FCALL                                               'var_dump'
          8        FETCH_OBJ_R                                      ~10     !1, 'y'
          9        IS_IDENTICAL                                     ~11     !2, ~10
         10        SEND_VAL                                                 ~11
         11        FETCH_OBJ_R                                      ~12     !2, 'x'
         12        IS_IDENTICAL                                     ~13     !1, ~12
         13        SEND_VAL                                                 ~13
         14        DO_ICALL                                                 
   38    15        ECHO                                                     '%0A'
   39    16        NEW                                              $15     'C'
         17        DO_FCALL                                      0          
         18        ASSIGN                                                   !0, $15
   40    19        FETCH_OBJ_R                                      ~18     !0, 'y'
         20        ASSIGN                                                   !2, ~18
   41    21        FETCH_OBJ_R                                      ~20     !0, 'x'
         22        ASSIGN                                                   !1, ~20
   42    23        INIT_FCALL                                               'var_dump'
         24        FETCH_OBJ_R                                      ~22     !1, 'y'
         25        IS_IDENTICAL                                     ~23     !2, ~22
         26        SEND_VAL                                                 ~23
         27        FETCH_OBJ_R                                      ~24     !2, 'x'
         28        IS_IDENTICAL                                     ~25     !1, ~24
         29        SEND_VAL                                                 ~25
         30        DO_ICALL                                                 
         31      > RETURN                                                   1

Class C:
Function __get:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 7
Branch analysis from position: 4
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Nb3VF
function name:  __get
number of ops:  16
compiled vars:  !0 = $key, !1 = $f
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   10     0  E >   RECV                                             !0      
   11     1        FETCH_OBJ_R                                      ~2      'buffer'
          2        ARRAY_KEY_EXISTS                                         !0, ~2
          3      > JMPZ                                                     ~3, ->7
   12     4    >   FETCH_OBJ_R                                      ~4      'buffer'
          5        FETCH_DIM_R                                      ~5      ~4, !0
          6      > RETURN                                                   ~5
   14     7    >   CONCAT                                           ~6      'calc_', !0
          8        ASSIGN                                                   !1, ~6
   15     9        INIT_METHOD_CALL                                         !1
         10        DO_FCALL                                      0  $10     
         11        FETCH_OBJ_W                                      $8      'buffer'
         12        ASSIGN_DIM                                       ~9      $8, !0
         13        OP_DATA                                                  $10
         14      > RETURN                                                   ~9
   16    15*     > RETURN                                                   null

End of function __get

Function calc_x:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Nb3VF
function name:  calc_x
number of ops:  11
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   18     0  E >   ECHO                                                     'C%3A%3Acalc_x%0A'
   19     1        NEW                                              $1      'stdClass'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $1
   20     4        INIT_METHOD_CALL                                         '__get'
          5        SEND_VAL_EX                                              'y'
          6        DO_FCALL                                      0  $5      
          7        ASSIGN_OBJ                                               !0, 'y'
          8        OP_DATA                                                  $5
   21     9      > RETURN                                                   !0
   22    10*     > RETURN                                                   null

End of function calc_x

Function calc_y:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Nb3VF
function name:  calc_y
number of ops:  14
compiled vars:  !0 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   24     0  E >   ECHO                                                     'C%3A%3Acalc_y%0A'
   25     1        NEW                                              $1      'stdClass'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $1
   27     4        FETCH_OBJ_W                                      $4      'buffer'
          5        ASSIGN_DIM                                               $4, 'y'
          6        OP_DATA                                                  !0
   28     7        INIT_METHOD_CALL                                         '__get'
          8        SEND_VAL_EX                                              'x'
          9        DO_FCALL                                      0  $7      
         10        ASSIGN_OBJ                                               !0, 'x'
         11        OP_DATA                                                  $7
   29    12      > RETURN                                                   !0
   30    13*     > RETURN                                                   null

End of function calc_y

End of class C.

Generated using Vulcan Logic Dumper, using php 8.0.0


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