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<?php isset([$x => $y][0]); isset(($x));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/gfIVa
function name:  (null)
number of ops:  6
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_ARRAY                                       ~2      !1, !0
          1        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      ~2, 0
          2        FREE                                                     ~3
    5     3        ISSET_ISEMPTY_CV                                 ~4      !0
          4        FREE                                                     ~4
          5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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