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<?php $text = '\x5Bli\x5DLevel\x3A\x2023\x5B\x2Fli\x5D'; var_dump(json_decode($text));
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/AZdFr
function name:  (null)
number of ops:  8
compiled vars:  !0 = $text
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '%5Cx5Bli%5Cx5DLevel%5Cx3A%5Cx2023%5Cx5B%5Cx2Fli%5Cx5D'
   4     1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL                                               'json_decode'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $2      
         5        SEND_VAR                                                 $2
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0