PHP script to display Google PageRank

PageRank is a numeric value that represents how important a page is on the web. It is Google’s way of measuring the importance of web site.Here is how Google explains PageRank:

PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page’s value. Google interprets a link from page A to page B as a vote, by page A, for page B. But Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves “important” weigh more heavily and help to make other pages “important.”

Google PageRank is mostly discussed by SEO’s but also webmasters, web advertisers and publishers. For example, webmasters will not exchange links with websites whose PageRank is less then 4 or 5. Often, web publishers will pay less money for ads on websites with lower PageRanks. So how do you know what a PageRank of a website is? Simplest way to do it is to install Google toolbar. There are also various tools and scripts out there that will tell you the PageRank. One of the popular scripts was the one published by www.googlecommunity.com.

Below is modified version of that script. I used the code to create a PHP class that can be easily implemented with your projects. I also included images for visual representation of the PageRank.

pagerank.php

</p> <p style="font-family: Courier New,Courier,mono"><font color="#cc0000"><strong><?php</strong></font><br /> <font color="#0000ff">define</font>(<font color="#cc0000">‘GOOGLE_MAGIC’</font>, <font color="#cc0000">0xE6359A60</font>);<br /> <font color="#336600">class</font> pageRank{<br /> <font color="#336600">var</font> $pr;<br /> <font color="#0000ff">function</font> zeroFill($a, $b){<br /> $z = hexdec(80000000);<br /> <font color="#336600">if</font> ($z & $a){<br /> $a = ($a>>1);<br /> $a &= (~$z);<br /> $a |= 0×40000000;<br /> $a = ($a>>($b-1));<br /> }<font color="#336600">else</font>{<br /> $a = ($a>>$b);<br /> }<br /> <font color="#336600">return</font> $a;<br /> }</p> <p><font color="#0000ff">function</font> mix($a,$b,$c) {<br /> $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,13));<br /> $b -= $c; $b -= $a; $b ^= ($a<<8);<br /> $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,13));<br /> $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,12));<br /> $b -= $c; $b -= $a; $b ^= ($a<<16);<br /> $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,5));<br /> $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,3));<br /> $b -= $c; $b -= $a; $b ^= ($a<<10);<br /> $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,15));<br /> <font color="#336600">return</font> <font color="#0000ff">array</font>($a,$b,$c);<br /> }</p> <p><font color="#0000ff">function</font> GoogleCH($url, $length=null, $init=GOOGLE_MAGIC) {<br /> <font color="#336600">if</font>(is_null($length)) {<br /> $length = sizeof($url);<br /> }<br /> $a = $b = 0×9E3779B9;<br /> $c = $init;<br /> $k = 0;<br /> $len = $length;<br /> <font color="#336600">while</font>($len >= 12) {<br /> $a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));<br /> $b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));<br /> $c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));<br /> $mix = $this->mix($a,$b,$c);<br /> $a = $mix[0]; $b = $mix[1]; $c = $mix[2];<br /> $k += 12;<br /> $len -= 12;<br /> }<br /> $c += $length;<br /> <font color="#336600">switch</font>($len){<br /> <font color="#336600">case</font> 11: $c+=($url[$k+10]<<24);<br /> <font color="#336600">case</font> 10: $c+=($url[$k+9]<<16);<br /> <font color="#336600">case</font> 9 : $c+=($url[$k+8]<<8);<br /> <font color="#ff6600"> <br /> </font> <font color="#336600">case</font> 8 : $b+=($url[$k+7]<<24);<br /> <font color="#336600">case</font> 7 : $b+=($url[$k+6]<<16);<br /> <font color="#336600">case</font> 6 : $b+=($url[$k+5]<<8);<br /> <font color="#336600">case</font> 5 : $b+=($url[$k+4]);<br /> <font color="#336600">case</font> 4 : $a+=($url[$k+3]<<24);<br /> <font color="#336600">case</font> 3 : $a+=($url[$k+2]<<16);<br /> <font color="#336600">case</font> 2 : $a+=($url[$k+1]<<8);<br /> <font color="#336600">case</font> 1 : $a+=($url[$k+0]);<br /> }<br /> $mix = $this->mix($a,$b,$c);<br /> <font color="#ff6600"> </font><br /> <font color="#336600">return</font> $mix[2];<br /> }</p> <p><font color="#ff6600">//converts a string into an array of integers containing the numeric value of the char </font></p> <p><font color="#0000ff">function</font> strord($string) {<br /> <font color="#336600">for</font>($i=0;$i<strlen($string);$i++) {<br /> $result[$i] = ord($string{$i});<br /> }<br /> <font color="#336600">return</font> $result;<br /> }</p> <p><font color="#0000ff">function</font> printrank($url){<br /> $ch = “6″.$this->GoogleCH($this->strord(”info:” . $url));</p> <p>$fp = <font color="#0000ff">fsockopen</font>(”<a href="http://www.google.com/">www.google.com</a>“, 80, $errno, $errstr, 30);<br /> <font color="#336600">if</font> (!$fp) {<br /> <font color="#0000ff">echo</font> “$errstr ($errno)<br />\n”;<br /> } <font color="#336600">else</font> {<br /> $out = <font color="#cc0000">“GET /search?client=navclient-auto&ch=”</font> . $ch . <font color="#cc0000">“&features=Rank&q=info:” </font>. $url . <font color="#cc0000">” HTTP/1.1\r\n”</font> ;<br /> $out .= <font color="#cc0000">“Host: </font><a href="http://www.google.com/r/n"><font color="#cc0000">www.google.com\r\n</font></a><font color="#cc0000">“</font> ;<br /> $out .= <font color="#cc0000">“Connection: Close\r\n\r\n”</font> ;<br /> <font color="#0000ff">fwrite</font>($fp, $out);<br /> <font color="#336600">while</font> (!feof($fp)) {<br /> $data = fgets($fp, 128);<br /> $pos = strpos($data, “Rank_”);<br /> <font color="#336600">if</font>($pos === false){<br /> }<font color="#336600">else</font>{<br /> $pagerank = substr($data, $pos + 9);<br /> $this->pr_image($pagerank);<br /> }<br /> }<br /> <font color="#0000ff">fclose</font>($fp);<br /> }<br /> }<br /> <font color="#ff6600">//display pagerank image. Create your own or <a href="http://www.bewebmaster.com/beseen/images/images.zip" target="_blank">download</a> images I made for this script. If you make your own make sure to call them pr0.gif, pr1.gif, pr2.gif etc.<br /> </font> <font color="#0000ff">function</font> pr_image($pagerank){<br /> $this->pr = <font color="#cc0000">“<img src=\”images/pr”<font color="#000000">.$pagerank.</font><font color="#cc0000">“</font>.gif\” alt=\”PageRank “</font>.$pagerank.<font color="#cc0000">” out of 10\”>” </font>;<br /> }<br /> <font color="#0000ff">function</font> get_pr(){<br /> <font color="#336600">return</font> $this->pr;<br /> }<br /> }<br /> <font color="#cc0000"><strong>?></strong></font></p> <p style="font-family: Courier New,Courier,mono">

Usage

Do following:

1. Save the code above as pagerank.php.
2. Download or create your own images to display each rank.
3. Create a directory “images” containing all page rank images.
4. See code below on how to use the class.

</p> <p style="font-family: Courier New,Courier,mono"><font color="#cc0000"><strong><?php<br /> </strong><font color="#336600">include</font>(”pagerank.php”);</font><br /> $gpr = <font color="#336600">new</font> pageRank();<br /> $gpr->printrank(”<a href="http://www.yahoo.com/">http://www.yahoo.com</a>“);<br /> <font color="#ff6600">//display image</font><br /> <font color="#0000ff">echo </font>$gpr->get_pr();<br /> <font color="#cc0000"><strong>?></strong></font></p> <p style="font-family: Courier New,Courier,mono">

UPDATE:

Some servers calculate the checksum differently which makes the script unusable. If the script doesn’t work for you test the script on a server (some free hosting account with PHP) that does it correctly and get the result that way.

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