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<?php $code = "12345003"; echo mb_substr($code, -3);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/XY19G
function name:  (null)
number of ops:  7
compiled vars:  !0 = $code
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, '12345003'
   4     1        INIT_FCALL                                               'mb_substr'
         2        SEND_VAR                                                 !0
         3        SEND_VAL                                                 -3
         4        DO_ICALL                                         $2      
         5        ECHO                                                     $2
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0