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<?php function f(&$i){ var_dump($i); var_dump(isset($i)); } f(); f($z);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MQTgS
function name:  (null)
number of ops:  6
compiled vars:  !0 = $z
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    8     0  E >   INIT_FCALL                                               'f'
          1        DO_FCALL                                      0          
    9     2        INIT_FCALL                                               'f'
          3        SEND_REF                                                 !0
          4        DO_FCALL                                      0          
          5      > RETURN                                                   1

Function f:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MQTgS
function name:  f
number of ops:  9
compiled vars:  !0 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    5     4        INIT_FCALL                                               'var_dump'
          5        ISSET_ISEMPTY_CV                                 ~2      !0
          6        SEND_VAL                                                 ~2
          7        DO_ICALL                                                 
    6     8      > RETURN                                                   null

End of function f

Generated using Vulcan Logic Dumper, using php 8.0.0


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