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<?php function _f() { return 'success'; } $f = '_f'; echo $f(); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qbV9S
function name:  (null)
number of ops:  5
compiled vars:  !0 = $f
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   6     0  E >   QM_ASSIGN                                                !0
   7     1        INIT_DYNAMIC_CALL                                        !0
         2        DO_FCALL                                      0  $2      
         3        ASSIGN_OBJ                                               $2
   9     4      > RETURN                                                   1

Function _f:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qbV9S
function name:  _f
number of ops:  2
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E > > RETURN                                                   'success'
   5     1*     > RETURN                                                   null

End of function _f

Generated using Vulcan Logic Dumper, using php 7.4.0