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<?php $numRecu = '1210330029427716163571'; var_dump(substr($numRecu, 5, 3).'-'.substr($numRecu, 8, 8).'-'.substr($numRecu, 16, 2));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ViBne
function name:  (null)
number of ops:  24
compiled vars:  !0 = $numRecu
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   ASSIGN                                                   !0, '1210330029427716163571'
    6     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'substr'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 5
          5        SEND_VAL                                                 3
          6        DO_ICALL                                         $2      
          7        CONCAT                                           ~3      $2, '-'
          8        INIT_FCALL                                               'substr'
          9        SEND_VAR                                                 !0
         10        SEND_VAL                                                 8
         11        SEND_VAL                                                 8
         12        DO_ICALL                                         $4      
         13        CONCAT                                           ~5      ~3, $4
         14        CONCAT                                           ~6      ~5, '-'
         15        INIT_FCALL                                               'substr'
         16        SEND_VAR                                                 !0
         17        SEND_VAL                                                 16
         18        SEND_VAL                                                 2
         19        DO_ICALL                                         $7      
         20        CONCAT                                           ~8      ~6, $7
         21        SEND_VAL                                                 ~8
         22        DO_ICALL                                                 
         23      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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