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<?php abstract class A { public static function get() { static $instance = null; if ($instance === null) { $instance = new static(); } return $instance; } } final class B extends A { } final class C extends A { } var_dump(A::get()); var_dump(B::get()); var_dump(C::get());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ZsPi2
function name:  (null)
number of ops:  16
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   18     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_STATIC_METHOD_CALL                                  'A', 'get'
          2        DO_FCALL                                      0  $0      
          3        SEND_VAR                                                 $0
          4        DO_ICALL                                                 
   19     5        INIT_FCALL                                               'var_dump'
          6        INIT_STATIC_METHOD_CALL                                  'B', 'get'
          7        DO_FCALL                                      0  $2      
          8        SEND_VAR                                                 $2
          9        DO_ICALL                                                 
   20    10        INIT_FCALL                                               'var_dump'
         11        INIT_STATIC_METHOD_CALL                                  'C', 'get'
         12        DO_FCALL                                      0  $4      
         13        SEND_VAR                                                 $4
         14        DO_ICALL                                                 
         15      > RETURN                                                   1

Class A:
Function get:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 6
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
filename:       /in/ZsPi2
function name:  get
number of ops:  8
compiled vars:  !0 = $instance
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   BIND_STATIC                                              !0
    5     1        TYPE_CHECK                                    2          !0
          2      > JMPZ                                                     ~1, ->6
    6     3    >   NEW                          static              $2      
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !0, $2
    8     6    > > RETURN                                                   !0
    9     7*     > RETURN                                                   null

End of function get

End of class A.

Class B:
Function get:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 6
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
filename:       /in/ZsPi2
function name:  get
number of ops:  8
compiled vars:  !0 = $instance
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   BIND_STATIC                                              !0
    5     1        TYPE_CHECK                                    2          !0
          2      > JMPZ                                                     ~1, ->6
    6     3    >   NEW                          static              $2      
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !0, $2
    8     6    > > RETURN                                                   !0
    9     7*     > RETURN                                                   null

End of function get

End of class B.

Class C:
Function get:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 6
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
filename:       /in/ZsPi2
function name:  get
number of ops:  8
compiled vars:  !0 = $instance
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   BIND_STATIC                                              !0
    5     1        TYPE_CHECK                                    2          !0
          2      > JMPZ                                                     ~1, ->6
    6     3    >   NEW                          static              $2      
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !0, $2
    8     6    > > RETURN                                                   !0
    9     7*     > RETURN                                                   null

End of function get

End of class C.

Generated using Vulcan Logic Dumper, using php 8.0.0


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