PHP normalize remote url's [duplicate]

This question already has an answer here: How do I apply URL normalization rules in PHP? (1 answer) Closed 9 years ago.

Is there any quick function that will convert: HtTp://www.ExAmPle.com/blah to http://www.example.com/blah

Basically I want to lower case the case-insen开发者_StackOverflow中文版sitive parts of a url.

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No, you'll have to write code for it on your own.

But you can use parse_url() to split the URL into its parts.

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Since you asked for "quick," here's a one-liner that does the job:

$url = 'HtTp://User:Pass@www.ExAmPle.com:80/Blah';

echo preg_replace_callback(
  '#(^[a-z]+://)(.+@)?([^/]+)(.*)$#i',
  create_function('$m',
                  'return strtolower($m[1]).$m[2].strtolower($m[3]).$m[4];'),
  $url);

Outputs:

http://User:Pass@www.example.com:80/Blah

EDIT/ADD:

I've tested, and this version is about 55% faster than using preg_replace_callback with an anonymous function:

echo preg_replace(
  '#(^[a-z]+://)(.+@)?([^/]+)(.*)$#ei',
  "strtolower('\\1').'\\2'.strtolower('\\3').'\\4'",
  $url);

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I believe this class will do what you're looking for http://www.glenscott.co.uk/blog/2011/01/09/normalize-urls-with-php/

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Here's a solution, expanding on what @ThiefMaster already mentioned:

DEMO

function urltolower($url){
  if (($_url = parse_url($url)) !== false){ // valid url
    $newUrl = strtolower($_url['scheme']) . "://";
    if ($_url['user'] && $_url['pass'])
      $newUrl .= $_url['user'] . ":" . $_url['pass'] . "@";
    $newUrl .= strtolower($_url['host']) . $_url['path'];
    if ($_url['query'])
      $newUrl .= "?" . $_url['query'];
    if ($_url['fragment'])
      $newUrl .= "#" . $_url['fragment'];
    return $newUrl;
  }
  return $url; // could return false if you'd like
}

Note: Not battle-tested but it should get you going.