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<?php $store = 0; var_dump(isset($store));
based on jm6OL
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6kmHN
function name:  (null)
number of ops:  6
compiled vars:  !0 = $store
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 0
   5     1        INIT_FCALL                                               'var_dump'
         2        <197>                                            ~2      !0
         3        SEND_VAL                                                 ~2
         4        DO_ICALL                                                 
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0