Mar 19
Calculate Google Pagerank with PHP
Monday, March 19th, 2007This is modified code that I found from the Internet the orginal code that may not work on some server that php has 32bit operation problem and I already tested on my server.
PHP:
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<?php
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//unsigned shift right
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function zeroFill($a, $b)
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{
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if ($z & $a)
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{
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$a = ($a>>1);
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$a &= (~$z);
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$a |= 0x40000000;
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$a = ($a>>($b-1));
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}
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else
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{
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$a = ($a>>$b);
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}
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return $a;
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}
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function toInt32(& $x){
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$y = (int)$x;
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if($y==-$z&&$x<-$z){
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$y = (int)((-1)*$x);
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$y = (-1)*$y;
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}
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$x = $y;
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}
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function mix($a,$b,$c) {
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$a -= $b; $a -= $c; toInt32($a); $a = (int)($a ^ (zeroFill($c,13)));
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$b -= $c; $b -= $a; toInt32($b); $b = (int)($b ^ ($a<<8));
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$c -= $a; $c -= $b; toInt32($c); $c = (int)($c ^ (zeroFill($b,13)));
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$a -= $b; $a -= $c; toInt32($a); $a = (int)($a ^ (zeroFill($c,12)));
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$b -= $c; $b -= $a; toInt32($b); $b = (int)($b ^ ($a<<16));
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$c -= $a; $c -= $b; toInt32($c); $c = (int)($c ^ (zeroFill($b,5)));
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$a -= $b; $a -= $c; toInt32($a); $a = (int)($a ^ (zeroFill($c,3)));
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$b -= $c; $b -= $a; toInt32($b); $b = (int)($b ^ ($a<<10));
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$c -= $a; $c -= $b; toInt32($c); $c = (int)($c ^ (zeroFill($b,15)));
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}
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function GoogleCH($url, $length=null, $init=GOOGLE_MAGIC) {
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}
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$a = $b = 0x9E3779B9;
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$c = $init;
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$k = 0;
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$len = $length;
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while($len>= 12) {
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$a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));
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$b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));
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$c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));
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$mix = mix($a,$b,$c);
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$a = $mix[0]; $b = $mix[1]; $c = $mix[2];
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$k += 12;
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$len -= 12;
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}
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$c += $length;
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switch($len) /* all the case statements fall through */
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{
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case 11: $c+=($url[$k+10]<<24);
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case 10: $c+=($url[$k+9]<<16);
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case 9 : $c+=($url[$k+8]<<8);
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/* the first byte of c is reserved for the length */
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case 8 : $b+=($url[$k+7]<<24);
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case 7 : $b+=($url[$k+6]<<16);
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case 6 : $b+=($url[$k+5]<<8);
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case 5 : $b+=($url[$k+4]);
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case 4 : $a+=($url[$k+3]<<24);
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case 3 : $a+=($url[$k+2]<<16);
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case 2 : $a+=($url[$k+1]<<8);
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case 1 : $a+=($url[$k+0]);
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/* case 0: nothing left to add */
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}
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$mix = mix($a,$b,$c);
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/*-------------------------------------------- report the result */
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return $mix[2];
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}
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//converts a string into an array of integers containing the numeric value of the char
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function strord($string) {
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for($i=0;$i<strlen($string);$i++) {
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}
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return $result;
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}
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// converts an array of 32 bit integers into an array with 8 bit values. Equivalent to (BYTE *)arr32
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function c32to8bit($arr32) {
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for($i=0;$i<count($arr32);$i++) {
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for ($bitOrder=$i*4;$bitOrder<=$i*4+3;$bitOrder++) {
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$arr8[$bitOrder]=$arr32[$i]&255;
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$arr32[$i]=zeroFill($arr32[$i], 8);
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}
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}
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return $arr8;
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}
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function get_page_rank($url){
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$reqgr = "info:".$url;
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$gch = "6".GoogleCH(strord($reqgr));
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if ( !$fsock ){
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echo 'Can not connect to server';
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return -1;
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}
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$base_get = "/search?client=navclient-auto&ch=".$gch."&ie=UTF-8&oe=UTF-8&features=Rank:FVN&q=".$reqgre;
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fputs($fsock, "User-Agent: Mozilla/4.0 (compatible; GoogleToolbar 2.0.114-big; Windows XP 5.1)\r\n");
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}
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return $m[1];
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}else{
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return -1;
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}
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}
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?>
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