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Editorial Team
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Asked: 2026-05-18T01:25:24+00:00

Is there a pre-existing function or class for URL normalization in PHP? Specifically, following

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Is there a pre-existing function or class for URL normalization in PHP?

Specifically, following the semantic preserving normalization rules laid out in this wikipedia article on URL normalization, (or whatever ‘standard’ I should be following).

  • Converting the scheme and host to lower case
  • Capitalizing letters in escape sequences
  • Adding trailing / (to directories, not files)
  • Removing the default port
  • Removing dot-segments

Right now, I’m thinking that I’ll just use parse_url(), and apply the rules individually, but I’d prefer to avoid reinventing the wheel.

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1 Answer

  1. Editorial Team

    The Pear Net_URL2 library looks like it’ll do at least part of what you want. It’ll remove dot segments, fix capitalization and get rid of the default port:

    include("Net/URL2.php");
$url = new Net_URL2('HTTP://example.com:80/a/../b/c');
print $url->getNormalizedURL();

    emits:

    http://example.com/b/c

    I doubt there’s a general purpose mechanism for adding trailing slashes to directories because you need a way to map urls to directories which is challenging to do in a generic way. But it’s close.

    References:

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