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<?php function buildRegexFrom(string $word): string { // Split word to letters $letters = str_split($word); // Creating all side of alternations in our regex foreach ($letters as $key => $letter) if (end($letters) != $letter) $regex[] = "$letter(?={$letters[$key + 1]})|(?<=$letter){$letters[$key + 1]}"; // Return whole cooked pattern return "~(?|((?>".implode('|', $regex).")+)|([$word]))~i"; } function longestSubstring(array $array, string $regex): array { foreach ($array as $value) { preg_match_all($regex, $value, $matches); usort($matches[1], function($a, $b) { return strlen($b) <=> strlen($a); }); // Store longest match being sorted $substrings[] = $matches[1][0]; } return $substrings; } print_r(longestSubstring(['Mymaxmuis', 'axmuis', 'muster'], buildRegexFrom('maxmuster')));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/7GOk3
function name:  (null)
number of ops:  11
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   27     0  E >   INIT_FCALL                                                   'print_r'
          1        INIT_FCALL                                                   'longestsubstring'
          2        SEND_VAL                                                     <array>
          3        INIT_FCALL                                                   'buildregexfrom'
          4        SEND_VAL                                                     'maxmuster'
          5        DO_FCALL                                          0  $0      
          6        SEND_VAR                                                     $0
          7        DO_FCALL                                          0  $1      
          8        SEND_VAR                                                     $1
          9        DO_ICALL                                                     
         10      > RETURN                                                       1

Function buildregexfrom:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 6, Position 2 = 27
Branch analysis from position: 6
2 jumps found. (Code = 78) Position 1 = 7, Position 2 = 27
Branch analysis from position: 7
2 jumps found. (Code = 43) Position 1 = 13, Position 2 = 26
Branch analysis from position: 13
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
Branch analysis from position: 26
Branch analysis from position: 27
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 27
filename:       /in/7GOk3
function name:  buildRegexFrom
number of ops:  38
compiled vars:  !0 = $word, !1 = $letters, !2 = $letter, !3 = $key, !4 = $regex
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   RECV                                                 !0      
    5     1        INIT_FCALL                                                   'str_split'
          2        SEND_VAR                                                     !0
          3        DO_ICALL                                             $5      
          4        ASSIGN                                                       !1, $5
    7     5      > FE_RESET_R                                           $7      !1, ->27
          6    > > FE_FETCH_R                                           ~8      $7, !2, ->27
          7    >   ASSIGN                                                       !3, ~8
    8     8        INIT_FCALL                                                   'end'
          9        SEND_REF                                                     !1
         10        DO_ICALL                                             $10     
         11        IS_NOT_EQUAL                                                 !2, $10
         12      > JMPZ                                                         ~11, ->26
    9    13    >   ROPE_INIT                                         7  ~18     !2
         14        ROPE_ADD                                          1  ~18     ~18, '%28%3F%3D'
         15        ADD                                                  ~13     !3, 1
         16        FETCH_DIM_R                                          ~14     !1, ~13
         17        ROPE_ADD                                          2  ~18     ~18, ~14
         18        ROPE_ADD                                          3  ~18     ~18, '%29%7C%28%3F%3C%3D'
         19        ROPE_ADD                                          4  ~18     ~18, !2
         20        ROPE_ADD                                          5  ~18     ~18, '%29'
         21        ADD                                                  ~15     !3, 1
         22        FETCH_DIM_R                                          ~16     !1, ~15
         23        ROPE_END                                          6  ~17     ~18, ~16
         24        ASSIGN_DIM                                                   !4
         25        OP_DATA                                                      ~17
    7    26    > > JMP                                                          ->6
         27    >   FE_FREE                                                      $7
   11    28        FRAMELESS_ICALL_2                implode             ~22     '%7C', !4
         29        CONCAT                                               ~23     '%7E%28%3F%7C%28%28%3F%3E', ~22
         30        ROPE_INIT                                         3  ~25     '%29%2B%29%7C%28%5B'
         31        ROPE_ADD                                          1  ~25     ~25, !0
         32        ROPE_END                                          2  ~24     ~25, '%5D%29%29%7Ei'
         33        CONCAT                                               ~27     ~23, ~24
         34        VERIFY_RETURN_TYPE                                           ~27
         35      > RETURN                                                       ~27
   12    36*       VERIFY_RETURN_TYPE                                           
         37*     > RETURN                                                       null

End of function buildregexfrom

Function longestsubstring:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 20
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 20
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 20
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 20
filename:       /in/7GOk3
function name:  longestSubstring
number of ops:  25
compiled vars:  !0 = $array, !1 = $regex, !2 = $value, !3 = $matches, !4 = $substrings
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   14     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
   15     2      > FE_RESET_R                                           $5      !0, ->20
          3    > > FE_FETCH_R                                                   $5, !2, ->20
   16     4    >   INIT_FCALL                                                   'preg_match_all'
          5        SEND_VAR                                                     !1
          6        SEND_VAR                                                     !2
          7        SEND_REF                                                     !3
          8        DO_ICALL                                                     
   17     9        INIT_FCALL                                                   'usort'
         10        FETCH_DIM_W                                          $7      !3, 1
         11        SEND_REF                                                     $7
         12        DECLARE_LAMBDA_FUNCTION                              ~8      [0]
   19    13        SEND_VAL                                                     ~8
   17    14        DO_ICALL                                                     
   21    15        FETCH_DIM_R                                          ~11     !3, 1
         16        FETCH_DIM_R                                          ~12     ~11, 0
         17        ASSIGN_DIM                                                   !4
         18        OP_DATA                                                      ~12
   15    19      > JMP                                                          ->3
         20    >   FE_FREE                                                      $5
   24    21        VERIFY_RETURN_TYPE                                           !4
         22      > RETURN                                                       !4
   25    23*       VERIFY_RETURN_TYPE                                           
         24*     > RETURN                                                       null


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/7GOk3
function name:  {closure:longestSubstring():17}
number of ops:  7
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   17     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
   18     2        STRLEN                                               ~2      !1
          3        STRLEN                                               ~3      !0
          4        SPACESHIP                                            ~4      ~2, ~3
          5      > RETURN                                                       ~4
   19     6*     > RETURN                                                       null

End of Dynamic Function 0

End of function longestsubstring

Generated using Vulcan Logic Dumper, using php 8.5.0


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