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<?php $a['foo'] = null; var_dump( isset( $a['foo'] ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jj9aP
function name:  (null)
number of ops:  7
compiled vars:  !0 = $a
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN_DIM                                                   !0, 'foo'
          1        OP_DATA                                                      null
    4     2        INIT_FCALL                                                   'var_dump'
          3        ISSET_ISEMPTY_DIM_OBJ                             0  ~2      !0, 'foo'
          4        SEND_VAL                                                     ~2
          5        DO_ICALL                                                     
          6      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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