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

Generated using Vulcan Logic Dumper, using php 8.0.0


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