How to Create Google Page Rank Script Using PHP

Page rank is created by Google to rank website based on popularity. Now you can create your own page rank look up script using PHP. I get this script from phurix.net website and modify it to have security code. For original source code, please check https://github.com/phurix/pagerank

First of all, we are going to create HTML form to capture URL and security code.

This is the index.php file contains the HTML form:

<?php
session_start();

/**
* PageRank Lookup (Based on Google Toolbar for Internet Explorer)
*
* @copyright 2011 HM2K <hm2k@php.net>
* @link http://pagerank.phurix.net/
* @author James Wade <hm2k@php.net>
* @version $Revision: 1.5 $
* @require PHP 4.3.0 (file_get_contents)
* @updated 06/10/11
*/

class PageRank {

/**
* @var string $host The Google hostname for PageRank
*/
var $host='toolbarqueries.google.com';

/**
* Returns the PageRank of a URL
*
* @param string $q The query/URL
* @param string $context A stream_context_create() context resource (optional).
*
* @return string
*/
function PageRank ($q,$context=NULL) {
$ch=$this->checksum($this->makehash($q));
$url='http://%s/tbr?client=navclient-auto&ch=%s&features=Rank&q=info:%s';
$url=sprintf($url,$this->host,$ch,$q);
$get_data = file_get_contents($url,false,$context);
$pr = explode(":", $get_data);
return $pr[2];
}

// 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 *= $magic;
/* If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31),
* the result of converting to integer is undefined.
* @see http://www.php.net/manual/en/language.types.integer.php
*/
if ($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 query
function makehash($string) {
$check1 = $this->strtonum($string, 0x1505, 0x21);
$check2 = $this->strtonum($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 checksum($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;
}
}

?>

<form method="post">
<table>
<tr>
<td>Website URL</td>
<td><input type=text name=q>&nbsp;<i>example: colekcolek.com</i></td>
</tr>
<tr>
<td valign="top">Security Code</td>
<td><input type=text name=c size="5">&nbsp;<img src="code.php" style="vertical-align:bottom"></td>
</tr>
<tr>
<td></td>
<td><input type=submit value="Check Page Rank"></td>
</tr>
</table>
</form>

<?php
$website_url = htmlentities($_POST['q']);
$website_url = addslashes($website_url);

if (isset($_POST['q']) && !empty($_POST['c'])) {
if ($_SESSION['rx_code'] == $_POST['c']) {

$pr = new PageRank($website_url);
$get_pr = $pr->PageRank($website_url);

?>
<table>
<tr>
<td>Website URL</td>
<td> : <?php echo $website_url?></td>
</tr>
<tr>
<td>Page Rank</td>
<td> : <?php echo $get_pr?>/10</td>
</tr>
</table>
<?php
} else {
echo "Wrong code !";
echo $_SESSION['rx_code'];
}

}  //eof
?>

And here is the code.php to display security code:

<?
header("Content-type: image/png");
session_cache_limiter('nocache');
session_start();

$rx = str_replace("0", "1", substr(md5(time()), 30));
$_SESSION['rx_code'] = $rx;

$im = ImageCreate(130,25);
$bgcolor = ImageColorAllocate($im, 255, 255, 255);
$fgcolor = ImageColorAllocate($im, 0, 0, 0);

ImageString($im, 5, 18, 5, "Code: ".$rx, $fgcolor);
ImagePng($im);

ImageDestroy($im); // free memory
?>

Now test the script, type in URL: facebook.com and security code which appears on screen and click Check Page Rank button.

Update April 23, 2012:

Found another page rank script. Credit to www.w3lessons.com.

The usage is still the same: echo GetPageRank($url);

function GetPageRank($url) {
$url = strstr($url,"http://")? $url:"http://".$url;
$fp = fsockopen("toolbarqueries.google.com", 80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />\n";
} else {
$out = "GET /tbr?client=navclient-auto&ch=".CheckHash(HashURL($url))."&features=Rank&q=info:".$url."&num=100&filter=0 HTTP/1.1\r\n";
$out .= "Host: toolbarqueries.google.com\r\n";
$out .= "User-Agent: Mozilla/4.0 (compatible; GoogleToolbar 2.0.114-big; Windows XP 5.1)\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);

while (!feof($fp)) {
$data = fgets($fp, 128);
$pos = strpos($data, "Rank_");
if($pos === false){} else{
$pagerank = substr($data, $pos + 9);
}
}
fclose($fp);
return (int)$pagerank;
}
}

function StrToNum($Str, $Check, $Magic) {
$Int32Unit = 4294967296; // 2^32
$length = strlen($Str);
for ($i = 0; $i < $length; $i++) {
$Check *= $Magic;
if ($Check >= $Int32Unit) {
$Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
$Check = ($Check < -2147483648)? ($Check + $Int32Unit) : $Check;
}
$Check += ord($Str{$i});
}
return $Check;
}

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);
}

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;
}