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<?php error_reporting(E_ALL); $foo = array('bar' => array('baz' => 5)); $bar = array('box' => 'baz'); var_dump(isset($foo['bar'][$bar['boom']]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/srm5f
function name:  (null)
number of ops:  12
compiled vars:  !0 = $foo, !1 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'error_reporting'
          1        SEND_VAL                                                 32767
          2        DO_ICALL                                                 
    3     3        ASSIGN                                                   !0, <array>
    4     4        ASSIGN                                                   !1, <array>
    5     5        INIT_FCALL                                               'var_dump'
          6        FETCH_DIM_R                                      ~6      !1, 'boom'
          7        FETCH_DIM_IS                                     ~5      !0, 'bar'
          8        ISSET_ISEMPTY_DIM_OBJ                         0  ~7      ~5, ~6
          9        SEND_VAL                                                 ~7
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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