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<?php class Foobar { function test() { $bar = "nasty"; $closure = function($foo) use ($bar) {}; $reflect = new ReflectionFunction($closure); //print_r($reflect); print_r($reflect->getClosureThis()); print_r($reflect->getClosureScopeClass()); } } (new Foobar())->test();
based on GBHBq
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/g9LsM
function name:  (null)
number of ops:  6
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   NOP                                                      
  18     1        NEW                                              $1      :-6
         2        DO_FCALL                                      0          
         3        INIT_METHOD_CALL                                         $1, 'test'
         4        DO_FCALL                                      0          
         5      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2Fg9LsM0x7fe28c02b066:
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/g9LsM
function name:  {closure}
number of ops:  4
compiled vars:  !0 = $foo, !1 = $bar
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   9     0  E >   RECV                                             !0      
         1        FETCH_R                      static              $2      'bar'
         2        ASSIGN                                                   !1, $2
         3      > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2Fg9LsM0x7fe28c02b066

Class Foobar:
Function test:
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/g9LsM
function name:  test
number of ops:  18
compiled vars:  !0 = $bar, !1 = $closure, !2 = $reflect
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   8     0  E >   ASSIGN                                                   !0, 'nasty'
   9     1        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2Fg9LsM0x7fe28c02b066'
         2        ASSIGN                                                   !1, ~4
  11     3        NEW                                              $6      :-4
         4        SEND_VAR_EX                                              !1
         5        DO_FCALL                                      0          
         6        ASSIGN                                                   !2, $6
  13     7        INIT_FCALL                                               'print_r'
         8        INIT_METHOD_CALL                                         !2, 'getClosureThis'
         9        DO_FCALL                                      0  $9      
        10        SEND_VAR                                                 $9
        11        DO_ICALL                                                 
  14    12        INIT_FCALL                                               'print_r'
        13        INIT_METHOD_CALL                                         !2, 'getClosureScopeClass'
        14        DO_FCALL                                      0  $11     
        15        SEND_VAR                                                 $11
        16        DO_ICALL                                                 
  15    17      > RETURN                                                   null

End of function test

End of class Foobar.

Generated using Vulcan Logic Dumper, using php 7.2.0