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<?php $a = "1035006110082"; echo $a[12] == substr($a, 0, 12) % 11;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vCIuR
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '1035006110082'
    3     1        FETCH_DIM_R                                      ~2      !0, 12
          2        INIT_FCALL                                               'substr'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 0
          5        SEND_VAL                                                 12
          6        DO_ICALL                                         $3      
          7        MOD                                              ~4      $3, 11
          8        IS_EQUAL                                         ~5      ~2, ~4
          9        ECHO                                                     ~5
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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