character encoding - Is ASCII "../" the only byte sequence that indicates a directory traversal in PHP? -

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I have a PHP app on which to select JS / CSS files $ _ GET The parameter uses the file system.

If I deny all requests in which the input string is a byte in ./ , \ or 7-bit ASCII range The PHP's underlying (C-based) file function is passed to the path when it is enough to prevent parent directory traverses?

I know, but there are no other alternative / perverse character encoding tricks which might scream from these checks?

Here is the basic idea (not the production code): 

  $ f = $ _GET ['f']; Eg eg "Path / Ko / file.js" // Goal: Select only CD / JS files within DOC_ROOT (Except! Preg_match ('@ ^ [\ x20- \ x7E] + $ @', $ f) // External Visual ASCII false! == Straps ($ F, "./") // is /. False! == Stropo ($ F, "\\") // has \ \ = 0 === Stropo (bassname ( $ F), ".") // .isHiddenFile ||! Preg_match ('@ \\. (CSS | JS) $ i @', $ f) // No JS / CSS ||! Is_file ($ _ SERVER ['DOCUMENT_ROOT']. '/'. $ F)) {dead (); } $ Content = file_get_contents ($ _ SERVER ['DOCUMENT_ROOT']. '/'. $ F); My question is really how the filesystem interprets anecdant ASCII sequences (for example, if ADAC is indexed escape), but I Know that it is possible to be system-based and perhaps inattentive in practice.  
 
 
  
 
  
 
  
  
  
 , Ensuring that the file is within DOC_ROOT, but the goal of this posting was  realpath ()  (it proved unreliable in various environments), while still uncommon but valid URIs like  / ~ User / [my files] /file.plugin.js .

You mention yourself, but the known route is the input of the reality Comparing it to the best solution that I can think of will solve any hidden attributes of Realpath Path / File System, which will include Simulink.


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