Extract/save links from posts.. wordpress.

linksfromposts.php

/* 
	Extracts URLs from post content, stores in post_meta in imploded array
	RegEX help from: http://ask.amoeba.co.in/regular-expression-in-php-extract-link-text-href/
*/

add_action('save_post','extract_urls');

function extract_urls($post_id){
	
	if ( !wp_is_post_revision( $post_id ) ) {

		$content_post = get_post($my_postid);

		preg_match_all("/\<a.*href=\"(.*?)\".*?\>(.*)\<\/a\>+/", stripslashes($content_post->post_content), $matches, PREG_SET_ORDER);

		if(!empty($matches)){
			delete_post_meta($post_id,'content_urls');
			foreach($matches as $url){
				$url[] = getPageTitle($url[1]);
				$value = implode("%%GG$$%%", $url);
				add_post_meta($post_id,'content_urls',$value);
			}
		} else {
			delete_post_meta($post_id,'content_urls');
			//update_post_meta($post_id,'content_urls','failed to find urls');
		}

	}
}
function lipson_return_urls($post_id){
	$urls = get_post_meta($post_id,'content_urls');
	foreach($urls as $key=>$val){
		$return[] = explode('%%GG$$%%',$val);
	}
	if(isset($return)){
		return $return;
	} else {
		return null;
	}
}

// get remote page title
function getPageTitle($Url){
    $ch = curl_init();
	curl_setopt($ch,CURLOPT_URL,$Url);
	curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
	$data = curl_exec($ch);
	curl_close($ch);

    if(strlen($data)>0){
        preg_match("/\<title\>(.*)\<\/title\>/",$data,$title);
        return $title[1];
    }
}