Stocking Club’s Blog

function contains_link($page_url, $link_url) {
	/* Get the page at page_url */
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $page_url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);

    curl_setopt($ch, CURLOPT_USERAGENT,
      'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');

    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    curl_setopt($ch, CURLOPT_TIMEOUT, 60);
    curl_setopt($ch, CURLOPT_FAILONERROR, true);

    $html = curl_exec($ch);
    curl_close($ch);

    if(!$html) return false; 

    /* Remove HTML comments and their contents */
    $html = preg_replace('//i’, ‘’, $html);

    /* Extract all links */
    $regexp=’/(]*hrefs*=s*["’]?)([^’" >]+)([’"]+[^<>]*>)/i’;
    if (!preg_match_all($regexp, $html, $matches, PREG_SET_ORDER)) {
	    return false; /* No links on page */
    };

    /* Check each link */
    foreach($matches as $match){
	    /* Skip links that contain rel=nofollow */
	    if(preg_match(’/rels*=s*[’"]?nofollow[’"]?/i’, $match[0])) continue;
	    /* If URL = backlink_url, we’ve found the backlink */
	    if ($match[2]==$link_url) return true;
    }

    return false;
}

/* Usage example */

if (contains_link(’http://w-shadow.com/’,'http://w-shadow.com/blog/’)) {
	echo ‘Reciprocal link found.’;
} else {
	echo ‘Reciprocal link not found.’;
};