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<?php $emailDomain = 'subdomain.example.co.uk'; $domainParts = explode('.', $emailDomain); // The TLD will never be in the allow list, so we can pop it off first $domain = array_pop($domainParts); $listToCheck = []; foreach (array_reverse($domainParts) as $domainPart) { $domain = $domainPart .'.'. $domain; $listToCheck[] = $domain; } var_dump($listToCheck);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 15, Position 2 = 22
Branch analysis from position: 15
2 jumps found. (Code = 78) Position 1 = 16, Position 2 = 22
Branch analysis from position: 16
1 jumps found. (Code = 42) Position 1 = 15
Branch analysis from position: 15
Branch analysis from position: 22
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 22
filename:       /in/qqLet
function name:  (null)
number of ops:  27
compiled vars:  !0 = $emailDomain, !1 = $domainParts, !2 = $domain, !3 = $listToCheck, !4 = $domainPart
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, 'subdomain.example.co.uk'
    4     1        INIT_FCALL                                                   'explode'
          2        SEND_VAL                                                     '.'
          3        SEND_VAR                                                     !0
          4        DO_ICALL                                             $6      
          5        ASSIGN                                                       !1, $6
    6     6        INIT_FCALL                                                   'array_pop'
          7        SEND_REF                                                     !1
          8        DO_ICALL                                             $8      
          9        ASSIGN                                                       !2, $8
    7    10        ASSIGN                                                       !3, <array>
    8    11        INIT_FCALL                                                   'array_reverse'
         12        SEND_VAR                                                     !1
         13        DO_ICALL                                             $11     
         14      > FE_RESET_R                                           $12     $11, ->22
         15    > > FE_FETCH_R                                                   $12, !4, ->22
    9    16    >   CONCAT                                               ~13     !4, '.'
         17        CONCAT                                               ~14     ~13, !2
         18        ASSIGN                                                       !2, ~14
   10    19        ASSIGN_DIM                                                   !3
         20        OP_DATA                                                      !2
    8    21      > JMP                                                          ->15
         22    >   FE_FREE                                                      $12
   13    23        INIT_FCALL                                                   'var_dump'
         24        SEND_VAR                                                     !3
         25        DO_ICALL                                                     
         26      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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