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<?php $a = new Exception("hi\0ryat"); echo $a; var_dump(serialize($a));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/oAGoK
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   NEW                                              $1      :-6
         1        SEND_VAL_EX                                              'hi%00ryat'
         2        DO_FCALL                                      0          
         3        ASSIGN                                                   !0, $1
   3     4        ECHO                                                     !0
   4     5        INIT_FCALL                                               'var_dump'
         6        INIT_FCALL                                               'serialize'
         7        SEND_VAR                                                 !0
         8        DO_ICALL                                         $4      
         9        SEND_VAR                                                 $4
        10        DO_ICALL                                                 
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0