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<?php var_dump(is_callable('f')); $a = null; $a(); f();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/mTcBp
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'is_callable'
          2        SEND_VAL                                                 'f'
          3        DO_ICALL                                         $1      
          4        SEND_VAR                                                 $1
          5        DO_ICALL                                                 
    3     6        ASSIGN                                                   !0, null
    4     7        INIT_DYNAMIC_CALL                                        !0
          8        DO_FCALL                                      0          
    5     9        INIT_FCALL_BY_NAME                                       'f'
         10        DO_FCALL                                      0          
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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