检查给定域名是否存在于url组php中

Question

I have an url whose format may be :
www.discover.com
http://discover.com
http://www.discover.com
http://www.abcd.discover.com
discover.com

And i have another url which may be any of below format:
www.discover.com/something/smoething
http://discover.com/something/smoething
http://www.discover.com/something/smoething
http://www.abcd.discover.com/something/smoething
discover.com/something/smoething

Now i want to compare this two urls to check whether domain name "discover.com" is present in the second url.

Am using below code :

$domain1 = str_ireplace('www.', '', parse_url($urlItem1, PHP_URL_HOST));
    $domain2= str_ireplace('www.', '', parse_url($urlItem2, PHP_URL_HOST));

    if(strstr($domain2, $domain1))
    {
        return $domain2;
    }

Solution :

function url_comparison($url1, $url2) {
$domain1 = parse_url($url1,PHP_URL_HOST);
$domain2 = parse_url($url2,PHP_URL_HOST);

$domain1 = isset($domain1) ? str_ireplace('www.', '',$domain1) : str_ireplace('www.', '',$url1); 
$domain2 = isset($domain2) ? str_ireplace('www.', '',$domain2) : str_ireplace('www.', '',$url2);

if(strstr($domain2, $domain1))
{
    return true;
}
else
{
    return false;
}
}

$url1 = "discover.com";
$url2 = "https://www.abcd.discover.com/credit-cards/resources/balance-transfer.shtml";

if(url_comparison($url1, $url2))
{
echo "Same Domain";
}
else
{
echo "Diffrent Domain";
}

Thanks.

Answer 1

Make use of the documentation, parse url

Then you should look at the hostname, and with use of strpos.

$url = parse_url('www.discover.com/something/smoething');

if (strpos($url['host'], 'discover.com') !== false) {
  // do you thing
}

0 is also a valid value so the !== or === is needed

To check if two domain are equal you need to set some rules, because is www.example.com the same as example.com, and is https the same as http?

function url_comparison($url_1, $url_2, $www = false, $scheme = false) {
    $url_part_1 = parse_url($url_1);
    $url_part_2 = parse_url($url_2);

    if ($scheme && $url_part_1['scheme'] !== $url_part_2['scheme']) {
        return false;
    }

    if ($www && $url_part_1['host'] === $url_part_2['host']) {
        return false;
    } elseif(!$www && (strpos($url_part_1['host'], $url_part_2['host']) !== false || strpos($url_part_2['host'], $url_part_1['host']) !== false)) {
        return false;
    }

    return true;
}

With the above function you should see the right direction, not tested so should be tweaked perhaps. The first 2 values should be an url. $www is a boolean if the 'www.' should be checked, and if $scheme = true also the https or http needs to be the same