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Geekpedia » PHP Code » Retrieve PageRank using PHP

Retrieve PageRank using PHP

This PHP code is designed to work on servers running the latest version of PHP as well, unlike most of the code samples on the web which will not work on many servers because of a checksum error.

On Tuesday, January 1st 2008 at 05:44 PM

By Andrew Pociu (View Profile)

(Rated 4 with 4 votes)

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<?php
//PageRank Lookup v1.1 by HM2K (update: 31/01/07)
//based on an alogoritham found here: http://pagerank.gamesaga.net/
 
//settings - host and user agent
$googlehost='toolbarqueries.google.com';
$googleua='Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5';
 
//convert a string to a 32-bit integer
function StrToNum($Str, $Check, $Magic) {
    $Int32Unit = 4294967296;  // 2^32
 
    $length = strlen($Str);
    for ($i = 0; $i < $length; $i++) {
        $Check *= $Magic;       
        //If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31), 
        //  the result of converting to integer is undefined
        //  refer to http://www.php.net/manual/en/language.types.integer.php
        if ($Check >= $Int32Unit) {
            $Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
            //if the check less than -2^31
            $Check = ($Check < -2147483648) ? ($Check + $Int32Unit) : $Check;
        }
        $Check += ord($Str{$i}); 
    }
    return $Check;
}
 
//genearate a hash for a url
function HashURL($String) {
    $Check1 = StrToNum($String, 0x1505, 0x21);
    $Check2 = StrToNum($String, 0, 0x1003F);
 
    $Check1 >>= 2;      
    $Check1 = (($Check1 >> 4) & 0x3FFFFC0 ) | ($Check1 & 0x3F);
    $Check1 = (($Check1 >> 4) & 0x3FFC00 ) | ($Check1 & 0x3FF);
    $Check1 = (($Check1 >> 4) & 0x3C000 ) | ($Check1 & 0x3FFF); 
        
    $T1 = (((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) <<2 ) | ($Check2 & 0xF0F );
    $T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0x3C00)) << 0xA) | ($Check2 & 0xF0F0000 );
        
    return ($T1 | $T2);
}
 
//genearate a checksum for the hash string
function CheckHash($Hashnum) {
    $CheckByte = 0;
    $Flag = 0;
 
    $HashStr = sprintf('%u', $Hashnum) ;
    $length = strlen($HashStr);
        
    for ($i = $length - 1;  $i >= 0;  $i --) {
        $Re = $HashStr{$i};
        if (1 === ($Flag % 2)) {              
            $Re += $Re;     
            $Re = (int)($Re / 10) + ($Re % 10);
        }
        $CheckByte += $Re;
        $Flag ++;       
    }
 
    $CheckByte %= 10;
    if (0 !== $CheckByte) {
        $CheckByte = 10 - $CheckByte;
        if (1 === ($Flag % 2) ) {
            if (1 === ($CheckByte % 2)) {
                $CheckByte += 9;
            }
            $CheckByte >>= 1;
        }
    }
 
    return '7'.$CheckByte.$HashStr;
}
 
//return the pagerank checksum hash
function getch($url) { return CheckHash(HashURL($url)); }
 
//return the pagerank figure
function getpr($url) {
        global $googlehost,$googleua;
        $ch = getch($url);
        $fp = fsockopen($googlehost, 80, $errno, $errstr, 30);
        if ($fp) {
           $out = "GET /search?client=navclient-auto&ch=$ch&features=Rank&q=info:$url HTTP/1.1\r\n";
           //echo "<pre>$out</pre>\n"; //debug only
           $out .= "User-Agent: $googleua\r\n";
           $out .= "Host: $googlehost\r\n";
           $out .= "Connection: Close\r\n\r\n";
        
           fwrite($fp, $out);
           
           //$pagerank = substr(fgets($fp, 128), 4); //debug only
           //echo $pagerank; //debug only
           while (!feof($fp)) {
                        $data = fgets($fp, 128);
                        //echo $data;
                        $pos = strpos($data, "Rank_");
                        if($pos === false){} else{
                                $pr=substr($data, $pos + 9);
                                $pr=trim($pr);
                                $pr=str_replace("\n",'',$pr);
                                return $pr;
                        }
           }
           //else { echo "$errstr ($errno)<br />\n"; } //debug only
           fclose($fp);
        }
}
 
//generate the graphical pagerank
function pagerank($url,$width=40,$method='style') {
        if (!preg_match('/^(http:\/\/)?([^\/]+)/i', $url)) { $url='http://'.$url; }
        $pr=getpr($url);
        $pagerank="PageRank: $pr/10";
 
        //The (old) image method
        if ($method == 'image') {
        $prpos=$width*$pr/10;
        $prneg=$width-$prpos;
        $html='<img src="http://www.google.com/images/pos.gif" width='.$prpos.' height=4 border=0 alt="'.$pagerank.'"><img src="http://www.google.com/images/neg.gif" width='.$prneg.' height=4 border=0 alt="'.$pagerank.'">';
        }
        //The pre-styled method
        if ($method == 'style') {
        $prpercent=100*$pr/10;
        $html='<div style="position: relative; width: '.$width.'px; padding: 0; background: #D9D9D9;"><strong style="width: '.$prpercent.'%; display: block; position: relative; background: #5EAA5E; text-align: center; color: #333; height: 4px; line-height: 4px;"><span></span></strong></div>';
        }
        
        $out='<a href="'.$url.'" title="'.$pagerank.'">'.$html.'</a>';
        return $out;
}
 
//if ((!isset($_POST['url'])) && (!isset($_GET['url']))) { echo '<form action="" method="post"><input name="url" type="text"><input type="submit" name="Submit" value="Get Pagerank"></form>'; }
if (isset($_REQUEST['url'])) { echo pagerank($_REQUEST['url']); }
?>

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Current Comments

by Arif Budiman on Saturday, February 23rd 2008 at 12:57 AM

Pretty good code for get PageRank from google, how ever when i am running why the result is \"PageRank: /10\", can you explain to me ?
and Thanx for the code

by semaj on Friday, August 7th 2009 at 03:55 AM

because the variable which is "$pr" $pagerank="PageRank: $pr/10"; is not concatenated to the string which is stored to the $pagerank variable.....hope you can get it right now...cheers!!!

by Dan on Sunday, November 8th 2009 at 02:35 AM

Works for me, thanks!

by Ken on Saturday, January 30th 2010 at 04:10 PM

Hi Andrew (or anybody),
I've use the above script for a while and it works most of the time. But there are some URL's for which it wont work such as

www.familyfunonadime.com

Any idea why some URL's wont work?

Thanks,

Ken