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<?php $strings = ["folders/folder1/folder5/../../folder2", "folders/folder1/../../../folder2", "folders/folder1/folder5/../folder2"]; foreach ($strings as $url) { echo preg_replace('~(?<=/|^)(?!\.\.(?![^/]))[^/\n]+/(?R)?\.\.(?:/|$)~', '', $url) . PHP_EOL; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 8
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 8
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 8
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
filename:       /in/41NKW
function name:  (null)
number of ops:  10
compiled vars:  !0 = $strings, !1 = $url
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    4     1      > FE_RESET_R                                           $3      !0, ->8
          2    > > FE_FETCH_R                                                   $3, !1, ->8
    5     3    >   FRAMELESS_ICALL_3                preg_replace        ~4      '%7E%28%3F%3C%3D%2F%7C%5E%29%28%3F%21%5C.%5C.%28%3F%21%5B%5E%2F%5D%29%29%5B%5E%2F%5Cn%5D%2B%2F%28%3FR%29%3F%5C.%5C.%28%3F%3A%2F%7C%24%29%7E', ''
          4        OP_DATA                                                      !1
          5        CONCAT                                               ~5      ~4, '%0A'
          6        ECHO                                                         ~5
    4     7      > JMP                                                          ->2
          8    >   FE_FREE                                                      $3
    6     9      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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