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<?php $values = [ '' => 'empty', 'foo' => 'bar', ]; var_export(isset($values[null]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kkPK5
function name:  (null)
number of ops:  6
compiled vars:  !0 = $values
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    8     1        INIT_FCALL                                                   'var_export'
          2        ISSET_ISEMPTY_DIM_OBJ                             0  ~2      !0, null
          3        SEND_VAL                                                     ~2
          4        DO_ICALL                                                     
          5      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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