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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; $v = $this->$f(); if (array_key_exists($key, $this->buffer)) { return $this->buffer[$key]; } return $this->buffer[$key] = $v; } 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/nXTYJ
function name:  (null)
number of ops:  32
compiled vars:  !0 = $c, !1 = $x, !2 = $y
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  37     0  E >   NEW                                              $3      :59
         1        DO_FCALL                                      0          
         2        QM_ASSIGN                                                !0
  38     3        FETCH_OBJ_R                                      ~6      !0, 'x'
         4        QM_ASSIGN                                                !1
  39     5        FETCH_OBJ_R                                      ~8      !0, 'y'
         6        QM_ASSIGN                                                !2
  40     7        INIT_FCALL                                               'var_dump'
         8        FETCH_OBJ_R                                      ~10     !1, 'y'
         9        IS_NOT_IDENTICAL                                 ~11     !2, ~10
        10        SEND_VAL                                                 ~11
        11        FETCH_OBJ_R                                      ~12     !2, 'x'
        12        IS_NOT_IDENTICAL                                 ~13     !1, ~12
        13        SEND_VAL                                                 ~13
        14        DO_ICALL                                                 
  42    15        ASSIGN_OBJ                                               '%0A'
  43    16        NEW                                              $15     :35
        17        DO_FCALL                                      0          
        18        QM_ASSIGN                                                !0
  44    19        FETCH_OBJ_R                                      ~18     !0, 'y'
        20        QM_ASSIGN                                                !2
  45    21        FETCH_OBJ_R                                      ~20     !0, 'x'
        22        QM_ASSIGN                                                !1
  46    23        INIT_FCALL                                               'var_dump'
        24        FETCH_OBJ_R                                      ~22     !1, 'y'
        25        IS_NOT_IDENTICAL                                 ~23     !2, ~22
        26        SEND_VAL                                                 ~23
        27        FETCH_OBJ_R                                      ~24     !2, 'x'
        28        IS_NOT_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
2 jumps found. (Code = 43) Position 1 = 15, Position 2 = 18
Branch analysis from position: 15
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/nXTYJ
function name:  __get
number of ops:  23
compiled vars:  !0 = $key, !1 = $f, !2 = $v
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  10     0  E >   RECV                                             !0      
  11     1        FETCH_OBJ_R                                      ~3      'buffer'
         2        FUNC_NUM_ARGS                                    ~4      !0, ~3
         3      > JMPZ                                                     ~4, ->7
  12     4    >   FETCH_OBJ_R                                      ~5      'buffer'
         5        FETCH_DIM_R                                      ~6      ~5, !0
         6      > RETURN                                                   ~6
  14     7    >   CONCAT                                           ~7      'calc_', !0
         8        QM_ASSIGN                                                !1
  15     9        INIT_METHOD_CALL                                         !1
        10        DO_FCALL                                      0  $9      
        11        QM_ASSIGN                                                !2
  16    12        FETCH_OBJ_R                                      ~11     'buffer'
        13        FUNC_NUM_ARGS                                    ~12     !0, ~11
        14      > JMPZ                                                     ~12, ->18
  17    15    >   FETCH_OBJ_R                                      ~13     'buffer'
        16        FETCH_DIM_R                                      ~14     ~13, !0
        17      > RETURN                                                   ~14
  19    18    >   FETCH_OBJ_W                                      $15     'buffer'
        19        ASSIGN_ADD                                    0  $16     $15, !0
        20        OP_DATA                                                  !2
        21      > RETURN                                                   $16
  20    22*     > 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/nXTYJ
function name:  calc_x
number of ops:  11
compiled vars:  !0 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  22     0  E >   ASSIGN_OBJ                                               'C%3A%3Acalc_x%0A'
  23     1        NEW                                              $1      :16
         2        DO_FCALL                                      0          
         3        QM_ASSIGN                                                !0
  24     4        INIT_METHOD_CALL                                         '__get'
         5        SEND_VAL_EX                                              'y'
         6        DO_FCALL                                      0  $5      
         7        ASSIGN_SUB                                    8          !0, 'y'
         8        OP_DATA                                                  $5
  25     9      > RETURN                                                   !0
  26    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/nXTYJ
function name:  calc_y
number of ops:  14
compiled vars:  !0 = $y
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  28     0  E >   ASSIGN_OBJ                                               'C%3A%3Acalc_y%0A'
  29     1        NEW                                              $1      :22
         2        DO_FCALL                                      0          
         3        QM_ASSIGN                                                !0
  31     4        FETCH_OBJ_W                                      $4      'buffer'
         5        ASSIGN_ADD                                    0          $4, 'y'
         6        OP_DATA                                                  !0
  32     7        INIT_METHOD_CALL                                         '__get'
         8        SEND_VAL_EX                                              'x'
         9        DO_FCALL                                      0  $7      
        10        ASSIGN_SUB                                   32          !0, 'x'
        11        OP_DATA                                                  $7
  33    12      > RETURN                                                   !0
  34    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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