pr值全称为pagerank.pagerank(网页级别)是google用于评测一个网页重要性的一种方法.在揉合了诸如title标识和keywords标识等所有其它因素之后.google通过pagerank来调整结果.使那些更具重要性的网页在搜索结果中另网站排名获得提升.从而提高搜索结果的相关性和质量.pr值最高为10.一般pr值达到4.就算是一个不错的网站了.
pagerank是google搜索排名算法中的一个组成部分,级别从1到10级,10级为满分,pr值越高说明该网页在搜索排名中的地位越重要,也就是说,在其他条件相同的情况下,pr值高的网站在google搜索结果的排名中有优先权.
// edit this to your website url:
$mywebsite = http://www.mycodes.net;
define('gmag', 0xe6359a60);
//unsigned shift right
function zerofill($a, $b) {
$z = hexdec(80000000);
if ($z & $a) {
$a = ($a>>1);
$a &= (~$z);
$a |= 0x40000000;
$a = ($a>>($b-1));
} else {
$a = ($a>>$b);
}
return $a;
}
function mix($a,$b,$c) {
$a -= $b; $a -= $c; $a ^= (zerofill($c,13));
$b -= $c; $b -= $a; $b ^= ($a$c -= $a; $c -= $b; $c ^= (zerofill($b,13));
$a -= $b; $a -= $c; $a ^= (zerofill($c,12));
$b -= $c; $b -= $a; $b ^= ($a$c -= $a; $c -= $b; $c ^= (zerofill($b,5));
$a -= $b; $a -= $c; $a ^= (zerofill($c,3));
$b -= $c; $b -= $a; $b ^= ($a$c -= $a; $c -= $b; $c ^= (zerofill($b,15));
return array($a,$b,$c);
}
function gch($url, $length=null, $init=gmag) {
if(is_null($length)) {
$length = sizeof($url);
}
$a = $b = 0x9e3779b9;
$c = $init;
$k = 0;
$len = $length;
while($len >= 12) {
$a += ($url[$k+0] +($url[$k+1]$b += ($url[$k+4] +($url[$k+5]$c += ($url[$k+8] +($url[$k+9]$mix = mix($a,$b,$c);
$a = $mix[0]; $b = $mix[1]; $c = $mix[2];
$k += 12;
$len -= 12;
}
$c += $length;
switch($len) {/* all the case statements fall through */
case 11: $c+=($url[$k+10]case 10: $c+=($url[$k+9]case 9 : $c+=($url[$k+8]/* the first byte of c is reserved for the length */
case 8 : $b+=($url[$k+7]case 7 : $b+=($url[$k+6]case 6 : $b+=($url[$k+5]case 5 : $b+=($url[$k+4]);
case 4 : $a+=($url[$k+3]case 3 : $a+=($url[$k+2]case 2 : $a+=($url[$k+1]case 1 : $a+=($url[$k+0]);
/* case 0: nothing left to add */
}
$mix = mix($a,$b,$c);
/*-------------------------------------------- report the result */
return $mix[2];
}
//converts a string into an array of integers containing the numeric value of the char
function strord($string) {
for($i=0;$i$result[$i] = ord($string{$i});
}
return $result;
}
function getpr($_url) {
$url = 'info:'.$_url;
$ch = gch(strord($url));
$url='info:'.urlencode($_url);
$pr = file(http://www.google.com/search?client=navclient-auto&ch=6$ch&ie=utf-8&oe=utf-8&features=rank&q=$url);
$pr_str = implode(, $pr);
return substr($pr_str,strrpos($pr_str, :)+1);
}
echo
the pr of $mywebsite is: .getpr($mywebsite);
?>
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