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<?php generate(); // FUNCTION function generate() { $digilist = "0123456789ABCDEFGHJKLMNPQRTUVWXY"; //now we generate a new random ID number using the substrings of the digitList string above $three_chars = NULL; $three_chars .= substr( $digilist, rand( 1, 9 ), 1 ); $three_chars .= substr( $digilist, rand( 10, 31 ), 1 ); $three_chars .= substr( $digilist, rand( 10, 31 ), 1 ); for( $i = 22; $i < 100; $i++) { $id = $three_chars . $i; $key = get_key( $id ); echo $id . "<br />" . $key . "<br />" . "-------------------------------------" . "<br />"; } } function get_key( $id ) { $digilist = "0123456789ABCDEFGHJKLMNPQRTUVWXY"; //ok so now we need to generate an MD5 hash of our ID $hash = md5($id); //cycle through the hash 16 (length of key) times (in steps of 2 because each hex bytes is 2 digits long) $i = 0; $key = NULL; for ($i; $i < 32; $i+=2) { //here we convert the next hex value to an integer and perform a bitwise AND operation against '31' //31 is the highest substring value in our digit list. $nextdigit = hexdec(substr($hash, $i, 2)) & 31; //if 'i' is divisable by 8 (every 4 cycles) then we want to add "-" if ((($i % 8) == 0) && ($i > 0)) { $key .= "-".substr($digilist, $nextdigit, 1); } else { $key .= substr($digilist, $nextdigit, 1); } } return $key; }
based on NTK79
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/g388q
function name:  (null)
number of ops:  5
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL_BY_NAME                                       'generate'
         1        DO_FCALL                                      0          
   6     2        NOP                                                      
  23     3        NOP                                                      
  49     4      > RETURN                                                   1

Function generate:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 48
Branch analysis from position: 48
2 jumps found. (Code = 44) Position 1 = 50, Position 2 = 34
Branch analysis from position: 50
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 34
2 jumps found. (Code = 44) Position 1 = 50, Position 2 = 34
Branch analysis from position: 50
Branch analysis from position: 34
filename:       /in/g388q
function name:  generate
number of ops:  51
compiled vars:  !0 = $digilist, !1 = $three_chars, !2 = $i, !3 = $id, !4 = $key
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   8     0  E >   ASSIGN                                                   !0, '0123456789ABCDEFGHJKLMNPQRTUVWXY'
  10     1        ASSIGN                                                   !1, null
  11     2        INIT_FCALL                                               'substr'
         3        SEND_VAR                                                 !0
         4        INIT_FCALL                                               'rand'
         5        SEND_VAL                                                 1
         6        SEND_VAL                                                 9
         7        DO_ICALL                                         $7      
         8        SEND_VAR                                                 $7
         9        SEND_VAL                                                 1
        10        DO_ICALL                                         $8      
        11        ASSIGN_CONCAT                                 0          !1, $8
  12    12        INIT_FCALL                                               'substr'
        13        SEND_VAR                                                 !0
        14        INIT_FCALL                                               'rand'
        15        SEND_VAL                                                 10
        16        SEND_VAL                                                 31
        17        DO_ICALL                                         $10     
        18        SEND_VAR                                                 $10
        19        SEND_VAL                                                 1
        20        DO_ICALL                                         $11     
        21        ASSIGN_CONCAT                                 0          !1, $11
  13    22        INIT_FCALL                                               'substr'
        23        SEND_VAR                                                 !0
        24        INIT_FCALL                                               'rand'
        25        SEND_VAL                                                 10
        26        SEND_VAL                                                 31
        27        DO_ICALL                                         $13     
        28        SEND_VAR                                                 $13
        29        SEND_VAL                                                 1
        30        DO_ICALL                                         $14     
        31        ASSIGN_CONCAT                                 0          !1, $14
  15    32        ASSIGN                                                   !2, 22
        33      > JMP                                                      ->48
  17    34    >   CONCAT                                           ~17     !1, !2
        35        ASSIGN                                                   !3, ~17
  18    36        INIT_FCALL_BY_NAME                                       'get_key'
        37        SEND_VAR_EX                                              !3
        38        DO_FCALL                                      0  $19     
        39        ASSIGN                                                   !4, $19
  19    40        CONCAT                                           ~21     !3, '%3Cbr+%2F%3E'
        41        CONCAT                                           ~22     ~21, !4
        42        CONCAT                                           ~23     ~22, '%3Cbr+%2F%3E'
        43        CONCAT                                           ~24     ~23, '-------------------------------------'
        44        CONCAT                                           ~25     ~24, '%3Cbr+%2F%3E'
        45        ECHO                                                     ~25
  15    46        POST_INC                                         ~26     !2
        47        FREE                                                     ~26
        48    >   IS_SMALLER                                       ~27     !2, 100
        49      > JMPNZ                                                    ~27, ->34
  21    50    > > RETURN                                                   null

End of function generate

Function get_key:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 40
Branch analysis from position: 40
2 jumps found. (Code = 44) Position 1 = 42, Position 2 = 9
Branch analysis from position: 42
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
2 jumps found. (Code = 46) Position 1 = 22, Position 2 = 24
Branch analysis from position: 22
2 jumps found. (Code = 43) Position 1 = 25, Position 2 = 33
Branch analysis from position: 25
1 jumps found. (Code = 42) Position 1 = 39
Branch analysis from position: 39
2 jumps found. (Code = 44) Position 1 = 42, Position 2 = 9
Branch analysis from position: 42
Branch analysis from position: 9
Branch analysis from position: 33
2 jumps found. (Code = 44) Position 1 = 42, Position 2 = 9
Branch analysis from position: 42
Branch analysis from position: 9
Branch analysis from position: 24
filename:       /in/g388q
function name:  get_key
number of ops:  44
compiled vars:  !0 = $id, !1 = $digilist, !2 = $hash, !3 = $i, !4 = $key, !5 = $nextdigit
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  23     0  E >   RECV                                             !0      
  25     1        ASSIGN                                                   !1, '0123456789ABCDEFGHJKLMNPQRTUVWXY'
  27     2        INIT_FCALL                                               'md5'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $7      
         5        ASSIGN                                                   !2, $7
  30     6        ASSIGN                                                   !3, 0
  31     7        ASSIGN                                                   !4, null
  32     8      > JMP                                                      ->40
  36     9    >   INIT_FCALL                                               'hexdec'
        10        INIT_FCALL                                               'substr'
        11        SEND_VAR                                                 !2
        12        SEND_VAR                                                 !3
        13        SEND_VAL                                                 2
        14        DO_ICALL                                         $11     
        15        SEND_VAR                                                 $11
        16        DO_ICALL                                         $12     
        17        BW_AND                                           ~13     $12, 31
        18        ASSIGN                                                   !5, ~13
  39    19        MOD                                              ~15     !3, 8
        20        IS_EQUAL                                         ~16     ~15, 0
        21      > JMPZ_EX                                          ~16     ~16, ->24
        22    >   IS_SMALLER                                       ~17     0, !3
        23        BOOL                                             ~16     ~17
        24    > > JMPZ                                                     ~16, ->33
  41    25    >   INIT_FCALL                                               'substr'
        26        SEND_VAR                                                 !1
        27        SEND_VAR                                                 !5
        28        SEND_VAL                                                 1
        29        DO_ICALL                                         $18     
        30        CONCAT                                           ~19     '-', $18
        31        ASSIGN_CONCAT                                 0          !4, ~19
        32      > JMP                                                      ->39
  45    33    >   INIT_FCALL                                               'substr'
        34        SEND_VAR                                                 !1
        35        SEND_VAR                                                 !5
        36        SEND_VAL                                                 1
        37        DO_ICALL                                         $21     
        38        ASSIGN_CONCAT                                 0          !4, $21
  32    39    >   ASSIGN_ADD                                    0          !3, 2
        40    >   IS_SMALLER                                       ~24     !3, 32
        41      > JMPNZ                                                    ~24, ->9
  48    42    > > RETURN                                                   !4
  49    43*     > RETURN                                                   null

End of function get_key

Generated using Vulcan Logic Dumper, using php 7.3.0