Google PageRank的计算源代码

最近对google的PageRank(网页等级)比较感兴趣，一直想知道如何不用google toolbar来获取pr值。苦苦搜索之后,找到如下代码:

\<?php\ /**\ This code is released unto the public domain\ */\ //header(\"Content-Type: text/plain; charset=utf-8\");\ define(\'GOOGLE_MAGIC\', 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\<\<8);\ \$c -= \$a; \$c -= \$b; \$c \^= (zeroFill(\$b,13));\ \$a -= \$b; \$a -= \$c; \$a \^= (zeroFill(\$c,12));\ \$b -= \$c; \$b -= \$a; \$b \^= (\$a\<\<16);\ \$c -= \$a; \$c -= \$b; \$c \^= (zeroFill(\$b,5));\ \$a -= \$b; \$a -= \$c; \$a \^= (zeroFill(\$c,3));\ \$b -= \$c; \$b -= \$a; \$b \^= (\$a\<\<10);\ \$c -= \$a; \$c -= \$b; \$c \^= (zeroFill(\$b,15));

return array(\$a,\$b,\$c);\ }

function GoogleCH(\$url, \$length=null, \$init=GOOGLE_MAGIC) {\ 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]\<\<8) +(\$url[\$k+2]\<\<16) +(\$url[\$k+3]\<\<24));\ \$b += (\$url[\$k+4] +(\$url[\$k+5]\<\<8) +(\$url[\$k+6]\<\<16) +(\$url[\$k+7]\<\<24));\ \$c += (\$url[\$k+8] +(\$url[\$k+9]\<\<8) +(\$url[\$k+10]\<\<16)+(\$url[\$k+11]\<\<24));\ \$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]\<\<24);\ case 10: \$c+=(\$url[\$k+9]\<\<16);\ case 9 : \$c+=(\$url[\$k+8]\<\<8);\ /* the first byte of c is reserved for the length */\ case 8 : \$b+=(\$url[\$k+7]\<\<24);\ case 7 : \$b+=(\$url[\$k+6]\<\<16);\ case 6 : \$b+=(\$url[\$k+5]\<\<8);\ case 5 : \$b+=(\$url[\$k+4]);\ case 4 : \$a+=(\$url[\$k+3]\<\<24);\ case 3 : \$a+=(\$url[\$k+2]\<\<16);\ case 2 : \$a+=(\$url[\$k+1]\<\<8);\ 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\<strlen(\$string);\$i++) {\ \$result[\$i] = ord(\$string{\$i});\ }\ return \$result;\ }\ // http://www.example.com/ - Checksum: 6540747202\ \$url = \'info:\'.\$_GET[\'url\'];\ \$ch = GoogleCH(strord(\$url));\ \$url=\'info:\'.urlencode(\$_GET[\'url\']);\ echo file_get_contents(\"http://www.google.com/search?client=navclient-auto&ch=6$ch&ie=UTF-8&oe=UTF-8&features=Rank&q=$url\");\ /* use curl send the user angent\ \$curl = curl_init(\"http://www.google.com/search?client=navclient-auto&ch=6$ch&ie=UTF-8&oe=UTF-8&features=Rank&q=$url\");\ curl_setopt (\$curl, CURLOPT_USERAGENT, \"Mozilla/4.0 (compatible; GoogleToolbar 2.0.110-big; Windows 2000 5.0)\");\ curl_exec(\$curl);\ */\ ?>\ \</>\</>

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Category: 月光博客2005

Wed 13 April 2005

Google PageRank的计算源代码

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