Can you explain this PHP Snippet?

Hello experts,

I'm working with a bit of code that was passed down to me and I don't quite have the ability to parse it to fully understand it. It's a crawler - so it's doing a lot of matching.

Could someone run through this and give me an explanation of what this is doing?

I have written some PHP but some of this is new on me, particularly starting with
 if($linksInArray[$Counter] == "" || $linksInArray[$Counter] == "#")
    continue;

Thank you!

 function get_a_href($url){
    $url = htmlentities(strip_tags($url));
    $ExplodeUrlInArray = explode('/',$url);
    $SubDomainName = $ExplodeUrlInArray[1];
    $DomainName = $ExplodeUrlInArray[2];
    $file = @file_get_contents($url);
    $h1count = preg_match_all('/(href=["|\'])(.*?)(["|\'])/i',$file,$patterns);
    $linksInArray = $patterns[2];
    $CountOfLinks = count($linksInArray);
    $InternalLinkCount = 0;
    $ExternalLinkCount = 0;
    for($Counter=0;$Counter<$CountOfLinks;$Counter++)
    {

    if($linksInArray[$Counter] == "" || $linksInArray[$Counter] == "#")
    continue;
    preg_match('/javascript:/', $linksInArray[$Counter],$CheckJavascriptLink);
    if($CheckJavascriptLink != NULL)
    continue;
    $Link = $linksInArray[$Counter];
    preg_match('/\?/', $linksInArray[$Counter],$CheckForArgumentsInUrl);
    if($CheckForArgumentsInUrl != NULL)
    {
    $ExplodeLink = explode('?',$linksInArray[$Counter]);
    $Link = $ExplodeLink[0];
    }
    preg_match('/'.$DomainName.'/',$Link,$Check);
    if($Check == NULL)
    {
    preg_match('/http:\/\//',$Link,$ExternalLinkCheck);
    if($ExternalLinkCheck == NULL)
    {
    $InternalDomainsInArray[$InternalLinkCount] = $Link;
    $InternalLinkCount++;
    }
    else
    {
    $ExternalDomainsInArray[$ExternalLinkCount] = $Link;
    $ExternalLinkCount++;
    }

    }
    else
    {
    $InternalDomainsInArray[$InternalLinkCount] = $Link;
    $InternalLinkCount++;
    }
    }

    $LinksResultsInArray = array(
    'ExternalLinks'=>$ExternalDomainsInArray,
    'InternalLinks'=>$InternalDomainsInArray
    );
    return $LinksResultsInArray;
    }

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