Compare URLs using PHP

Question

I have the following 3 urls

http://www.yahoo.co.uk and http://yahoo.co.uk, the difference being that the later doesn't have www in it. When using parse_url on both these url's, the output is the following.

{"scheme":"http","host":"www.yahoo.co.uk"}

{"scheme":"http","host":"yahoo.co.uk"}

Both url's being the same, comparing them using a == or using strpos or explode the text with . and compare each array doesn't seem to be ideal.

I have looked at the other questions on Stack Overflow that discusses about comparing URL's but they don't seem to be addressing the issue I have mentioned above. Appreciate if someone could help me figure out how to solve this issue.

does it matter if there's anything after the domain? such as /index/?module=blah? — Rogue
– Rogue, Commented Sep 29, 2013 at 4:52
The URLs are not the same. There's no rule that says that www.DOMAIN has to be the same as DOMAIN, although it usually is. — Barmar
– Barmar, Commented Sep 29, 2013 at 4:56
Actually, there are 2 different domains. Try to cut off the "www" part and then compare what you have to compare there. — Paul Denisevich
– Paul Denisevich, Commented Sep 29, 2013 at 5:00

Michael · Accepted Answer · 2013-09-30 02:13:30Z

3

Simple helper functions:

function compareUrls($a, $b) {
    $a = parse_url($a, PHP_URL_HOST);
    $b = parse_url($b, PHP_URL_HOST);

    return trimWord($a) === trimWord($b);
}

function trimWord($str) {
    if (stripos($str, 'www.') === 0) {
        return substr($str, 4);
    }
    return $str;
}

var_dump(compareUrls('http://www.yahoo.co.uk', 'http://yahoo.co.uk'));

Outputs:

bool(true)

edited Sep 30, 2013 at 2:13

answered Sep 29, 2013 at 5:04

Michael

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