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<?php $str = 'aaaaaa'; var_dump( isset($str['a']) );
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/1Rb88
function name:  (null)
number of ops:  6
compiled vars:  !0 = $str
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'aaaaaa'
   4     1        INIT_FCALL                                               'var_dump'
         2        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~2      !0, 'a'
         3        SEND_VAL                                                 ~2
         4        DO_ICALL                                                 
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0