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<?php class MyStuff extends ArrayObject { function offsetGet($offset) { echo "Called", PHP_EOL; return parent::offsetGet($offset); } } $array = array( 'foo' => 42, 'baz' => null, ); $array_object = new MyStuff($array); // existing key, non-null value: var_dump(isset($array['foo'])); //true var_dump(empty($array['foo'])); //false var_dump(isset($array_object['foo'])); //true var_dump(empty($array_object['foo'])); //false echo PHP_EOL; // non-existing key: var_dump(isset($array['bar'])); //false var_dump(empty($array['bar'])); //true var_dump(isset($array_object['bar'])); //true var_dump(empty($array_object['bar'])); //false echo PHP_EOL; // key where value is null: var_dump(isset($array['baz'])); //false var_dump(empty($array['baz'])); //true var_dump(isset($array_object['baz'])); //true var_dump(empty($array_object['baz'])); //false
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fR47K
function name:  (null)
number of ops:  56
compiled vars:  !0 = $array, !1 = $array_object
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   10     0  E >   ASSIGN                                                   !0, <array>
   15     1        NEW                                              $3      'MyStuff'
          2        SEND_VAR_EX                                              !0
          3        DO_FCALL                                      0          
          4        ASSIGN                                                   !1, $3
   18     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      !0, 'foo'
          7        SEND_VAL                                                 ~6
          8        DO_ICALL                                                 
   19     9        INIT_FCALL                                               'var_dump'
         10        ISSET_ISEMPTY_DIM_OBJ                         1  ~8      !0, 'foo'
         11        SEND_VAL                                                 ~8
         12        DO_ICALL                                                 
   21    13        INIT_FCALL                                               'var_dump'
         14        ISSET_ISEMPTY_DIM_OBJ                         0  ~10     !1, 'foo'
         15        SEND_VAL                                                 ~10
         16        DO_ICALL                                                 
   22    17        INIT_FCALL                                               'var_dump'
         18        ISSET_ISEMPTY_DIM_OBJ                         1  ~12     !1, 'foo'
         19        SEND_VAL                                                 ~12
         20        DO_ICALL                                                 
   23    21        ECHO                                                     '%0A'
   26    22        INIT_FCALL                                               'var_dump'
         23        ISSET_ISEMPTY_DIM_OBJ                         0  ~14     !0, 'bar'
         24        SEND_VAL                                                 ~14
         25        DO_ICALL                                                 
   27    26        INIT_FCALL                                               'var_dump'
         27        ISSET_ISEMPTY_DIM_OBJ                         1  ~16     !0, 'bar'
         28        SEND_VAL                                                 ~16
         29        DO_ICALL                                                 
   29    30        INIT_FCALL                                               'var_dump'
         31        ISSET_ISEMPTY_DIM_OBJ                         0  ~18     !1, 'bar'
         32        SEND_VAL                                                 ~18
         33        DO_ICALL                                                 
   30    34        INIT_FCALL                                               'var_dump'
         35        ISSET_ISEMPTY_DIM_OBJ                         1  ~20     !1, 'bar'
         36        SEND_VAL                                                 ~20
         37        DO_ICALL                                                 
   31    38        ECHO                                                     '%0A'
   34    39        INIT_FCALL                                               'var_dump'
         40        ISSET_ISEMPTY_DIM_OBJ                         0  ~22     !0, 'baz'
         41        SEND_VAL                                                 ~22
         42        DO_ICALL                                                 
   35    43        INIT_FCALL                                               'var_dump'
         44        ISSET_ISEMPTY_DIM_OBJ                         1  ~24     !0, 'baz'
         45        SEND_VAL                                                 ~24
         46        DO_ICALL                                                 
   37    47        INIT_FCALL                                               'var_dump'
         48        ISSET_ISEMPTY_DIM_OBJ                         0  ~26     !1, 'baz'
         49        SEND_VAL                                                 ~26
         50        DO_ICALL                                                 
   38    51        INIT_FCALL                                               'var_dump'
         52        ISSET_ISEMPTY_DIM_OBJ                         1  ~28     !1, 'baz'
         53        SEND_VAL                                                 ~28
         54        DO_ICALL                                                 
         55      > RETURN                                                   1

Class MyStuff:
Function offsetget:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fR47K
function name:  offsetGet
number of ops:  8
compiled vars:  !0 = $offset
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   RECV                                             !0      
    5     1        ECHO                                                     'Called'
          2        ECHO                                                     '%0A'
    6     3        INIT_STATIC_METHOD_CALL                                  'offsetGet'
          4        SEND_VAR_EX                                              !0
          5        DO_FCALL                                      0  $1      
          6      > RETURN                                                   $1
    7     7*     > RETURN                                                   null

End of function offsetget

End of class MyStuff.

Generated using Vulcan Logic Dumper, using php 8.0.0


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