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<?php $nums = [ '5551234', '8045551234', '18045551234', '0018045551234', ]; foreach ($nums as $num) { echo substr($num, -10); echo ' '; echo substr($num, 0, -10); echo PHP_EOL; var_dump( substr($num, 0, -10) ); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 25
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 25
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 25
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 25
filename:       /in/kGmmE
function name:  (null)
number of ops:  27
compiled vars:  !0 = $nums, !1 = $num
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   10     1      > FE_RESET_R                                       $3      !0, ->25
          2    > > FE_FETCH_R                                               $3, !1, ->25
   11     3    >   INIT_FCALL                                               'substr'
          4        SEND_VAR                                                 !1
          5        SEND_VAL                                                 -10
          6        DO_ICALL                                         $4      
          7        ECHO                                                     $4
   12     8        ECHO                                                     '+'
   13     9        INIT_FCALL                                               'substr'
         10        SEND_VAR                                                 !1
         11        SEND_VAL                                                 0
         12        SEND_VAL                                                 -10
         13        DO_ICALL                                         $5      
         14        ECHO                                                     $5
   14    15        ECHO                                                     '%0A'
   15    16        INIT_FCALL                                               'var_dump'
         17        INIT_FCALL                                               'substr'
         18        SEND_VAR                                                 !1
         19        SEND_VAL                                                 0
         20        SEND_VAL                                                 -10
         21        DO_ICALL                                         $6      
         22        SEND_VAR                                                 $6
         23        DO_ICALL                                                 
   10    24      > JMP                                                      ->2
         25    >   FE_FREE                                                  $3
   16    26      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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