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<?php $x = 'a:1:{i:0;O:9:"exception":1:{s:17:"'."\0".'Exception'."\0".'string";R:2;}}'; $x = unserialize($x); var_dump($x);
based on E8lZA
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/2OqkT
function name:  (null)
number of ops:  9
compiled vars:  !0 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'a%3A1%3A%7Bi%3A0%3BO%3A9%3A%22exception%22%3A1%3A%7Bs%3A17%3A%22%00Exception%00string%22%3BR%3A2%3B%7D%7D'
   4     1        INIT_FCALL                                               'unserialize'
         2        SEND_VAR                                                 !0
         3        DO_ICALL                                         $2      
         4        ASSIGN                                                   !0, $2
   6     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0