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<?php $sum = function($a, $b) { return $a + $b; }; function test ($callback) { return call_user_func($callback(2, 13)); }; echo test('sum');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Q2bJe
function name:  (null)
number of ops:  7
compiled vars:  !0 = $sum
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FQ2bJe%3A3%240'
          1        ASSIGN                                                   !0, ~1
   11     2        INIT_FCALL                                               'test'
          3        SEND_VAL                                                 'sum'
          4        DO_FCALL                                      0  $3      
          5        ECHO                                                     $3
          6      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FQ2bJe%3A3%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Q2bJe
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    4     2        ADD                                              ~2      !0, !1
          3      > RETURN                                                   ~2
    5     4*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FQ2bJe%3A3%240

Function test:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Q2bJe
function name:  test
number of ops:  9
compiled vars:  !0 = $callback
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   RECV                                             !0      
    8     1        INIT_DYNAMIC_CALL                                        !0
          2        SEND_VAL_EX                                              2
          3        SEND_VAL_EX                                              13
          4        DO_FCALL                                      0  $1      
          5        INIT_USER_CALL                                0          'call_user_func', $1
          6        DO_FCALL                                      0  $2      
          7      > RETURN                                                   $2
    9     8*     > RETURN                                                   null

End of function test

Generated using Vulcan Logic Dumper, using php 8.0.0


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