PHP - Function to skip strtolower() if variable contain "wikipedia.org"

Question

Hello,

My site allows users to enter URLs into a database. I am using the code "$site = strtolower($site);" to make all of these URLs lower-case.

However, I just realized that Wikipedia URLs are case sensitive, so I would like to avoid using "$site = strtolower($site);" on Wikipedia URLs, all of which contain "wikipedia.org".

How could I write a function that will skip over the step "$site = strtolower($site);" if $site contains "wikipedia.org"?

Thanks in advance,

John

Answer 1

stripos() will tell you if a string exists at any point within another. Check that, and if it's not there, strtolower() will be safe.

Answer 2

if(stristr($site, 'wikipedia.org') === FALSE){
 echo "doesn't contain wikipedia.org";
}else{
 echo "wikipedia.org!";
}

Update

Just a short note on storing urls in your database. It is NOT uncommon for a directory, file, username, password or parameter on a server to contain uppercase characters. Although the interpretation depends on the underlying OS, webserver and code I would strongly recommend to not use strtolower() for anything except maybe the domain and protocol.

Answer 3

All URLs on *nix servers are case-sensitive. Some URLs on Windows servers are also case-sensitive.

Edit: The domain name is case-insensitive (actually, the client converts it to lowercase).

http://user:[email protected]/somedir/somefile.ext?someQueryString=someValue#fragment
=======----------==========--------------------------------------------------------

Legend:
    - : Case sensitive
    = : Case insensitive

Note: By specification fragments are supposed to be case sensitive but it is not implemented that way on all clients.

This is a very bad idea to do what you are trying to do. The best way would be to just lowercase the domain name.

Edit 2: Since you asked, here is a function that will properly lowercase a given URL (scheme and domain only):

function urltolower($url) {
    $parts = @parse_url($url);
    if($parts === FALSE) return FALSE;
    $url = '';

    if(!empty($parts['scheme'])) $url .= strtolower($parts['scheme']) . (($parts['scheme'] == 'file') ? ':///' : '://');
    if(!empty($parts['user'])) $url .= $parts['user'] . ((!empty($parts['pass'])) ? ':' . $parts['pass'] : '') . '@';
    if(!empty($parts['host'])) $url .= strtolower($parts['host']);
    if(!empty($parts['port'])) $url .= ':' . $parts['port'];
    if(!empty($parts['path'])) $url .= $parts['path'];
    if(!empty($parts['query'])) $url .= '?' . $parts['query'];
    if(!empty($parts['fragment'])) $url .= '#' . $parts['fragment'];

    return $url;
}

[mixed] urltolower($url)

Lowercases an URL. Returns FALSE on failure. Returns lowercased URL on success.

Example:

echo urltolower('HTTP://en.WikiPedia.org/wiki/PHP');
//echo's http://en.wikipedia.org/wiki/PHP

Answer 4

This is a bad idea. URLs in general are allowed to be case-sensitive, so why would you throw away info? If you do this, you'll have to add exception after exception.

Answer 5

Making a simple If condition can solve your problem. Set your conditions for your requirements