Funcion para ver el ranking de una keyword en google

[andresdzphp]

Por hay buscando en google me encontré varias clases, dejo una:

Código PHP:

<?php  
/** 
 * This class crawls google and find out on which page a website is lisited, based on the keyword searched. 
 * 
 * @author Rochak Chauhan <[email protected]> 
 * @see This class does NOT calculated the Google Page Rank 
 */ 
class PhpKeywordAnalyser { 
    private $website=""; 
    private $keyword=""; 
    private $url=""; 
    private $start=0; 
    private $page=false; 
    private $records=false; 
 
    /** 
     * Function to pre process and store the values of Keyword and Website 
     * 
     * @param string $keyword 
     * @param string $website 
     * @return resource 
     */ 
    public function __construct($keyword, $website){ 
        if(trim($keyword)==""){ 
            trigger_error("Keyword cannot the left blank.",E_USER_ERROR); die(); 
        } 
        if(trim($website)==""){ 
            trigger_error("Website cannot the left blank.",E_USER_ERROR); die(); 
        } 
        $website=strtolower(trim($website)); 
        $website=str_replace("http://www.","",$website); 
        $website=str_replace("http://","",$website); 
        $website=str_replace("www.","",$website); 
        $website=str_replace("/","",$website); 
     
        $this->website=$website; 
        $this->keyword=trim($keyword); 
        $this->enableVerbose=$enableVerbose;         
        $this->url=$this->updateUrl($keyword, $this->start); 
    } 
 
    /** 
     * This function starts the crawling process and it verbose the content as it goes to next page. 
     * 
     * @return string [buffer] 
     */ 
    public function initSpider(){ 
        echo "<p>Searching: <b>".$this->keyword."</b> and Looking for: <b>".$this->website."</b></p>"; 
        echo str_repeat(" ", 256); 
        $i=10; 
        $c=1; 
        while($c<=10) {             
            echo "<ul><li><b>Searching in Page: $c</b></li>";                 
            flush();ob_flush(); 
            $records= $this->getRecordsAsArray($this->url);  
            $count=count($records); 
            echo "<ul>"; 
            for($k=0;$k<$count;$k++){ 
                $j=$k+1; 
                $link=$records[$k][2]; 
                $link=strip_tags($link); 
                $link=str_replace("http://www.","",$link); 
                $link=str_replace("http://","",$link); 
                $link=str_replace("www.","",$link); 
                $pos=strpos($link, "/"); 
                $link=trim(substr($link,0,$pos)); 
                 
                if($this->website==$link){ 
                    $domain=$this->website; 
                    echo "<li><h1>Result was found in Page: $c and Record: $j</h1></li>"; 
                    echo "<div>Congrats, We searched google's top 10 pages for <b>\"".$this->keyword."</b>\", we found your domain <b>\"$domain\"</b> listed on page: $c at $j place </div>";echo "</ul></ul>"; 
                    exit; 
                } 
                else{ 
                    echo "<li>Result not found on Page: $c and Record: $j</li>"; 
                }                 
            } 
            echo "</ul></ul>"; 
            $c++; 
            $this->updateUrl($this->keyword, $i); 
        } 
        echo "Crawled through all 10 pages.";             
         
        if($this->page==false){ 
            $domain=$this->website; 
            $keyword=$this->keyword; 
            echo "<div>Sorry, We searched google's top 10 pages for <b>\"$keyword\"</b>, but was unable to find your domain <b>\"$domain\"</b> listed anywhere. </div>"; 
        } 
        else { 
            $page=$this->page; 
            $records=$this->records; 
            $domain=$this->website; 
            $keyword=$this->keyword; 
            echo "<div>Congrats, We searched google's top 10 pages for <b>\"$keyword\"</b>, we found your domain <b>\"$domain\"</b> listed on page: $page at $record place </div>"; 
        } 
    } 
     
    /** 
     * Function to get records as an array. 
     * 
     * @access private 
     * @param string $url 
     * 
     * @return array 
     */ 
    private function getRecordsAsArray($url){ 
        $matches=array(); 
        $pattern='/<div class="s"(.*)\<cite\>(.*)\<\/cite\>/Uis'; 
        $html=$this->getCodeViaFopen($url); 
        preg_match_all($pattern, $html, $matches, PREG_SET_ORDER); 
        return $matches; 
    } 
     
    /** 
     * Function to update the google search query. 
     * 
     * @access private 
     * @param string $keyword 
     * @param string $start 
     * 
     * @return string 
     */ 
    private function updateUrl($keyword, $start){ 
        $this->start=$this->start+$start;     
        $keyword=trim($keyword); 
        $keyword=urlencode($keyword); 
        return "http://www.google.com/search?start=".$this->start."&q=$keyword"; 
    } 
 
    /** 
     * Function to get HTML code from remote url 
     * 
     * @access private 
     * @param string $url 
     * 
     * @return string 
     */ 
    private function getCodeViaFopen($url){ 
        $returnStr=""; 
        $fp=fopen($url, "r") or die("ERROR: Invalid search URL"); 
        while (!feof($fp)) { 
            $returnStr.=fgetc($fp); 
        } 
        fclose($fp); 
        return $returnStr; 
    } 
}
 
$keyword="Google"; 
$website="www.google.com"; 
 
// optional for accepting parameters from Query string 
if(isset($_GET['keyword'])) { $keyword=$_GET['keyword']; } 
if(isset($_GET['website'])) { $website=$_GET['website']; } 
 
$phpKeywordAnalyser = new PhpKeywordAnalyser($keyword, $website); 
$phpKeywordAnalyser->initSpider();
 

En http://www.phpclasses.org/ hay varias parecidas para que saques ideas.

Aclaro que la clase es gracias a Rochak Chauhan
License: Free For Educational Use

Saludos: