Backlink Checker - Dokumentation - Die Klasse

Klasse _class_backlink_checker.php
 
 
//*****************************************************************************************************************
// Copyright by webinteger.net
// Author: Günther Trojan / 2007
//*****************************************************************************************************************
 
class seo_tools{
 
	var $url;
	var $partner_url;
	var $ziel_url;
	var $linktext;
	var $array_parse_url = array();
	var $user_agent = "webinteger.net/backlinkchecker";
	var $array_http_status = array();
	var $partner_quelltext;
	var $link_array = array();
	var $link_array_all = array();
	var $externe_links;
	var $interne_links;
 
	//*****************************************************************************************************************
	// 	partner_url
	//*****************************************************************************************************************
 
	function partner_url($partner_url){
		$this->partner_url = $this->url_aufbereiten($partner_url);
	}
 
	//*****************************************************************************************************************
	// 	partner_url
	//*****************************************************************************************************************
 
	function ziel_url($ziel_url){
		$this->ziel_url = $this->url_aufbereiten($ziel_url);
	}
 
	//*****************************************************************************************************************
	// 	linktext
	//*****************************************************************************************************************
 
	function linktext($linktext){
		$this->linktext = trim(strtolower($linktext));
	}
 
	//*****************************************************************************************************************
	// 	url_aufbereiten
	//*****************************************************************************************************************
 
	function url_aufbereiten($url){
		$url = trim($url);
		if(empty($url)) return FALSE;
		$array_parse_url = parse_url($url);
		if(!isset($array_parse_url["scheme"])) $url = "http://".$url;
		return $url;
	}
 
	//*****************************************************************************************************************
	// 	check_backlink
	//*****************************************************************************************************************
 
	function check_backlink(){
		$this->get_http_status($this->partner_url);
		if($this->array_http_status["Status-Code"][0] == 2){
			$this->get_link($this->partner_url, $this->ziel_url, $linktext, $linktitle);
		}else{
			return false;
		}
	}
 
	//*****************************************************************************************************************
	// 	get_http_status
	//*****************************************************************************************************************
 
	function get_http_status($url, $abbruch=false){
 
		if(empty($url)) return FALSE;
		$this->url = $url;
		$this->array_parse_url = parse_url($this->url);
		if(!isset($this->array_parse_url["scheme"])) $this->array_parse_url["scheme"] = "http";
		if(!isset($this->array_parse_url["port"])) $this->array_parse_url["port"] = 80;
		if(!isset($this->array_parse_url["path"])) $this->array_parse_url["path"] = "/";
 
		$fp = fsockopen($this->array_parse_url["host"], $this->array_parse_url["port"], $errno, $errstr, 15);
 
		if(!$fp){
			if($abbruch){
				$this->array_http_status["Location-Status-Code"] = "Seite nicht gefunden - Zeitüberschreitung";
			}else{
				$this->array_http_status["Status-Line"] = "Angegebene Seite nicht gefunden";
				$this->array_http_status["HTTP-Version"] = "-";
				$this->array_http_status["Status-Code"] = "408";
				$this->array_http_status["Reason-Phrase"] = "Zeitüberschreitung";
			}
			return;
		}else{
			$head = "";
			fputs($fp, "GET ".$this->array_parse_url["path"]." HTTP/1.1\r\n");
			fputs($fp, "Host: ".$this->array_parse_url["host"]."\r\n");
			fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
			fputs($fp, "Content-length: ".strlen($parameters). "\r\n");
			fputs($fp, "User-Agent: ".$this->user_agent."\r\n");
			fputs($fp, "Connection: close\r\n\r\n");
 
			$this->partner_quelltext = "";
			while(!feof($fp)) $this->partner_quelltext.= fgets($fp, 1024);
			fclose($fp);
 
			preg_match("=^(HTTP/\d+\.\d+) (\d{3}) ([^\r\n]*)=", $this->partner_quelltext, $treffer);
 
			if($abbruch){
				$this->array_http_status["Location-Status-Code"] = $treffer[2];
			}else{
				$this->array_http_status["Status-Line"] = $treffer[0];
				$this->array_http_status["HTTP-Version"] = $treffer[1];
				$this->array_http_status["Status-Code"] = $treffer[2];
				$this->array_http_status["Reason-Phrase"] = $treffer[3];
 
				$http_klassen = array("Informational", "Successful", "Redirection", "Client Error", "Server Error");
				$this->array_http_status["Response-Class"] = $http_klassen[$this->array_http_status["Status-Code"][0] - 1];
				preg_match_all("=^(.+): ([^\r\n]*)=m", $this->partner_quelltext, $treffer, PREG_SET_ORDER);
				foreach($treffer as $zeile){
					$this->array_http_status[$zeile[1]] = $zeile[2]; 
				}
				if($this->array_http_status["Status-Code"][0] == 3){
					$this->get_http_status($this->array_http_status["Location"], true);
				}
			}
		}
	}
 
	//*****************************************************************************************************************
	// 		get_link
	//*****************************************************************************************************************
 
	function get_link($url, $zielurl, $linktext, $linktitle){
 
		$domain = $this->partner_quelltext;
		$domain = str_replace("\r", "", $domain);
		$domain = str_replace("\t", "", $domain);
		$domain = str_replace("\n", "", $domain);
		$domain = preg_replace("/ +/", " ", $domain); 
		$domain = strtolower($domain); 
 
		if(preg_match('/<body(?:.*?)>(.*)<\/body>/is', $domain, $matches)) { 
    		$content_body = $matches[1]; 
		} 
 
		$pattern = "/<a(.*?)>(.*?)<\/a>/is";
		$anzahl_links = preg_match_all($pattern, $content_body, $links);
 
		$this->anzahl_interne_externe_links($links);
 
		for($i=0; $i < count($links[1]); $i++){
 
			$link_tmp = htmlspecialchars($links[1][$i]);
			$link_tmp = str_replace("&quot;", "", $link_tmp);
			$link_tmp = str_replace("'", "", $link_tmp);
			if(eregi($this->ziel_url, $link_tmp)){
				$array_a_attribut = array();
				$parse_link = explode(" ", $link_tmp);
				for($x=0; $x < count($parse_link); $x++){
					if(eregi("=", $parse_link[$x])){
						$parse_link2 = explode("=", $parse_link[$x]);
						$array_key = $parse_link2[0];
						$array_value = trim($parse_link2[1]);
						$array_komplett = array($array_key=>$array_value); 
						$this->link_array = array_merge($this->link_array, $array_komplett);
					}
				}
				$array_linktext = array("linktext"=>strip_tags($links[2][$i]));
				$this->link_array = array_merge($this->link_array, $array_linktext);
				array_push($this->link_array_all, $this->link_array);
			}
		}
	}
 
	//*****************************************************************************************************************
	// 		anzahl_interne_externe_links
	//*****************************************************************************************************************
 
	function anzahl_interne_externe_links($links){
 
		$this->externe_links = 0;
		$this->interne_links = 0;
 
		for($i=0; $i < count($links[1]); $i++){
			$link_tmp = htmlspecialchars($links[1][$i]);
			$url_host = parse_url($this->partner_url);
			if(eregi($url_host["host"], $link_tmp)){
				$this->interne_links++;
			}else{
				if(eregi("http://", $link_tmp)){
					$this->externe_links++;
				}else{
					$this->interne_links++;
				}
			}
		}
	}
}