class get pagerank

 class PR {
 public function get_google_pagerank($url) {
 $query="http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=".$this->CheckHash($this->HashURL($url)). "&features=Rank&q=info:".$url."&num=100&filter=0";
 $data=file_get_contents($query);
 $pos = strpos($data, "Rank_");
 if($pos === false){} else{
 $pagerank = substr($data, $pos + 9);
 return $pagerank;
 }
 }
 public function StrToNum($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 $Check;
 }
 public function HashURL($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 | $T2);
 }
 public function CheckHash($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;
 }
}