Check Google PageRank With PHP

<?php
function get_google_pagerank($url) {
    $query="http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=".CheckHash(HashURL($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;
    }
}
 
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;
}
?>

<?php
$url='http://4rapiddev.com/';
echo "$url has Google PageRank: ". get_google_pagerank($url) ;
?>

http://4rapiddev.com/ has Google PageRank: 1