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<?php class C { function __isset($x) { return false; } } $x = new C(); echo empty($x);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ETTMl
function name:  (null)
number of ops:  6
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    8     0  E >   NEW                                              $1      'C'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    9     3        ISSET_ISEMPTY_CV                                 ~4      !0
          4        ECHO                                                     ~4
          5      > RETURN                                                   1

Class C:
Function __isset:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ETTMl
function name:  __isset
number of ops:  3
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   RECV                                             !0      
          1      > RETURN                                                   <false>
          2*     > RETURN                                                   null

End of function __isset

End of class C.

Generated using Vulcan Logic Dumper, using php 8.0.0


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