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<?php function foo(callable $fn): void { // do something with $fn, call it maybe $fn(); } foo(static function (): void { echo 'hello world'; });
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5qegC
function name:  (null)
number of ops:  5
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    9     0  E >   INIT_FCALL                                                   'foo'
          1        DECLARE_LAMBDA_FUNCTION                              ~0      [0]
   11     2        SEND_VAL                                                     ~0
    9     3        DO_FCALL                                          0          
   11     4      > RETURN                                                       1


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5qegC
function name:  {closure:/in/5qegC:9}
number of ops:  2
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   10     0  E >   ECHO                                                         'hello+world'
   11     1      > RETURN                                                       null

End of Dynamic Function 0

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

End of function foo

Generated using Vulcan Logic Dumper, using php 8.5.0


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