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<?php $str = 'Yes'; var_dump($str['1active']); var_dump($str['page_id']);
based on C2D5r
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/LCYiI
function name:  (null)
number of ops:  10
compiled vars:  !0 = $str
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'Yes'
   4     1        INIT_FCALL                                               'var_dump'
         2        FETCH_DIM_R                                      $2      !0, '1active'
         3        SEND_VAR                                                 $2
         4        DO_ICALL                                                 
   5     5        INIT_FCALL                                               'var_dump'
         6        FETCH_DIM_R                                      $4      !0, 'page_id'
         7        SEND_VAR                                                 $4
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0