This is a set of simple functions to find the Google pagerank of any page or site. It basically pretends to be a web browser using the Google toolbar which displays the pagerank to the user.
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.$HashStr;
}
function getpagerank($url){
$fp = fsockopen("toolbarqueries.google.com", 80, $errno, $errstr, 30);
if(!$fp){
echo "$errstr ($errno)
\n";
}else{
$out="GET /search?client=navclient-auto&ch=".CheckHash(HashURL($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);
return $pagerank;
}
}
fclose($fp);
}
}
You can make calls to it like this:
getpagerank('http://www.google.com');
You can also use this stylesheet which excludes the need for pagerank image icons (though you could use image files if you wished):
<STYLE>
div.pr {
font-size: 6pt;
color: #000000;
float: left;
height: 30px;
margin-right: 5px;
}
div.prg {
width: 40px;
border: 1px solid #999999;
height: 3px;
font-size: 1px;
}
div.prb {
background: #5eaa5e;
height: 3px;
font-size: 1px;
}
</STYLE>
To use PHP to display the pagerank of a site you would use:
$url='http://www.seanbluestone.com';
$Pagerank=getpagerank('http://www.seanbluestone.com');
$Width=$PR*4;
echo '<div class="pr">PR: '.$Pagerank.'<div class="prg"><div class="prb" style="width: '.$Width.'px"></div></div> '.$url;
This would display the pagerank of the page like this:
SeanBluestone.com
One thing to note is that if you make too many calls to this within a short period of time from the same domain it will block you, so if you’re using it for a link directory or something like that make sure it caches.
You can discuss this article and see what others are saying about it in the PHP Discussion Forum
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