Use local css file if link to online css file is dead

Question

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The problem:

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I am using w3.css(if you enter now w3schools.com site is down for maintenance) for styling my website.The problem

Answer 1

Its possible with PHP. I haven't tested it but it should work.

Put this inside your tag.

';
} else {
    echo '';
}

//returns true, if domain is availible, false if not
   function isDomainAvailible($domain)
   {
           //check, if a valid url is provided
           if(!filter_var($domain, FILTER_VALIDATE_URL))
           {
                   return false;
           }

           //initialize curl
           $curlInit = curl_init($domain);
           curl_setopt($curlInit,CURLOPT_CONNECTTIMEOUT,10);
           curl_setopt($curlInit,CURLOPT_HEADER,true);
           curl_setopt($curlInit,CURLOPT_NOBODY,true);
           curl_setopt($curlInit,CURLOPT_RETURNTRANSFER,true);

           //get answer
           $response = curl_exec($curlInit);

           curl_close($curlInit);

           if ($response) return true;

           return false;
   }

?>

Reference: https://css-tricks.com/snippets/php/check-if-website-is-available/