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<?php // The difference between the $fnc() and call_user_func($fnc) class A { function foo() { echo 'foo'; } } class B extends A { function __call($name, $args) { $fnc = 'parent::foo'; call_user_func($fnc); // works $fnc(); // error Call to undefined function parent::foo() } } $b = new B; $b->bar();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iBMM2
function name:  (null)
number of ops:  6
compiled vars:  !0 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   24     0  E >   NEW                                              $1      'B'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
   25     3        INIT_METHOD_CALL                                         !0, 'bar'
          4        DO_FCALL                                      0          
          5      > RETURN                                                   1

Class A:
Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iBMM2
function name:  foo
number of ops:  2
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   ECHO                                                     'foo'
   10     1      > RETURN                                                   null

End of function foo

End of class A.

Class B:
Function __call:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iBMM2
function name:  __call
number of ops:  8
compiled vars:  !0 = $name, !1 = $args, !2 = $fnc
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   16     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   18     2        ASSIGN                                                   !2, 'parent%3A%3Afoo'
   19     3        INIT_USER_CALL                                0          'call_user_func', !2
          4        DO_FCALL                                      0          
   20     5        INIT_DYNAMIC_CALL                                        !2
          6        DO_FCALL                                      0          
   21     7      > RETURN                                                   null

End of function __call

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iBMM2
function name:  foo
number of ops:  2
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   ECHO                                                     'foo'
   10     1      > RETURN                                                   null

End of function foo

End of class B.

Generated using Vulcan Logic Dumper, using php 8.0.0


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