如何将随机域名转换为小写一致的URL？

Question

I have this function in a class:

protected $supportedWebsitesUrls = ['www.youtube.com', 'www.vimeo.com', 'www.dailymotion.com'];

protected function isValid($videoUrl)
{
    $urlDetails = parse_url($videoUrl);

    if (in_array($urlDetails['host'], $this->supportedWebsitesUrls))
    {
        return true;
    } else {
        throw new \Exception('This website is not supported yet!');

        return false;
    }

}

It basically extracts the host name from any random url and then checks if it is in the $supportedWebsitesUrls array to ensure that it is from a supported website. But if I add say: dailymotion.com instead of www.dailymotion.com it won't detect that url. Also if I try to do WWW.DAILYMOTION.COM it still won't work. What can be done? Please help me.

Answer 1

You can use preg_grep function for this. preg_grep supports regex matches against a given array.

Sample use:

$supportedWebsitesUrls = array('www.dailymotion.com', 'www.youtube.com', 'www.vimeo.com');

$s = 'DAILYMOTION.COM';

if ( empty(preg_grep('/' . preg_quote($s, '/') . '/i', $supportedWebsitesUrls)) )
   echo 'This website is not supported yet!
';
else
   echo "found a match
";

Output:

found a match