I'm currently using base64 to encode a short string and decode it later, and wonder if a better (shorter) alternative is possible.
$string = '/path/to/img/image.jpg';
$convertedString = base64_encode($string);
// New session, new user
$convertedString = 'L3BhdGgvdG8vaW1nL2ltYWdlLmpwZw==';
$originalString = base64_decode('L3BhdGgvdG8vaW1nL2ltYWdlLmpwZw==');
// Can $convertedString be shorter by any means ?
Requirements :
Goal :
Get a clean unique id from a path file that is not the path file and can be used in a URL, without using a database.
I've searched and read a lot, looks like it doesn't exist but couldn't find a definitive answer.
Well since you're using these in a URL, why not use rawurlencode($string) and rawurldecode($encodedString)?
If you can reserve one character like - (i.e., ensure that - never appears in your file names), you can do even better by doing rawurlencode(str_replace('/', '-', $string)) and str_replace('-', '/', rawurldecode($encodedString)). Depending on the file names you pick, this will create IDs that are the same length as the original filename. (This won't work if your file names have multi-byte characters in them; you will need to use some mb_* functions for that case.)
You could try using compression functions, but for strings as short as file paths, compression usually makes the output larger than the input.
Ultimately, unless you are willing to use a database, disallow certain file names, or you know something about what kinds of file names will come up, the best you can hope for is IDs that are as short or almost as short as the original file names. Otherwise, this would be a universal compression function, which is impossible.
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