PHP help, please

I have developed a broken link checker that works great, unless the URLs don't have the base href in them.
For example:
If the links are ...href="http://www.somesite.com/somepage.html"... is works great
But if they are ...href="somepage.html"..., ...href="/somepage.html"..., or...href="./somepage.html"... it ignors them

Here's the problem code:

 $matches = array(); 
  preg_match_all("|href\=\"?'?`?([[:alnum:]:?=&@/;._-]+)\"?'?`?|i",  $html, $matches); 
  $links = array(); 
  $ret = $matches[1]; 
  for($i=0;isset($ret[$i]);$i++) { 
     if(preg_match("|^http://(.*)|i", $ret[ $i])) { 
         $links[] = $ret[$i]; 
     } elseif(preg_match("|^(.*)|i", $ret[$i])) { 
         $links[] = "http://".$info["host"]."". $ret[$i]; 
     } 
  } 
  return $links; 
} 

Code (markup):

I thought
} elseif(preg_match("|^(.*)|i", $ret[$i])) {
$links[] = "http://".$info["host"]."". $ret[$i];
would have taken care if it. Please help!
Many Thanks.

 

The problem here is that it's hard to debug regex just by looking at it, however can I suggest you try using standard functions where ever possible for example for checking if there is an http:// in the url you could use strpos.

Here is a simple function which (if tested) would probably cover most urls but for urls that start with ./ they are probably within a subfolder below the root so how can you work out their full URL?

function format_url($url, $domain_url){
    if( strpos($url, $domain_url) !== false ) {

           /* Remove first slash from url if present */
           if( substr(0,1,$url) == '/' )  {
                $url = substr ( 1, count($url), $url);
           }
 
          /* Append domain URL to URL*/
          return $domain_url . $url;
    }
}

PHP:

Dunno if this helps.