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<?php $string = ‘cat’; var_dump(isset($string[‘type’]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/87Y0J
function name:  (null)
number of ops:  8
compiled vars:  !0 = $string
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   FETCH_CONSTANT                                   ~1      '%E2%80%98cat%E2%80%99'
         1        ASSIGN                                                   !0, ~1
   4     2        INIT_FCALL                                               'var_dump'
         3        FETCH_CONSTANT                                   ~3      '%E2%80%98type%E2%80%99'
         4        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~4      !0, ~3
         5        SEND_VAL                                                 ~4
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0