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Google PageRank PHP5 Class

This PHP5 class computes the Google PR for any URL. Source code is available online and this is the PHP5 version, can be plugged into any application/software.

<?php
/** source available online in public domain
* @author Son Nguyen
* @since 3/30/2006
* @package Framework
* @subpackage WebServices
*/
class CGooglePR {
  /** constructor */
  function __construct() {
  }

function getRank($pURL) {
    $pURL = 'info:'.$pURL;
    $ch = $this->GoogleCH($this->strord($pURL));
    $vFile = "http://www.google.com/search?client=navclient-auto&ch=6$ch&features=Rank&q=".$pURL;
    $data = file($vFile);
    $rankarray = explode (':', $data[2]);
    $rank = $rankarray[2];
    return intval($rank);
  }

/** 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);
    } // fi
    return $a;
  }

function mix($a,$b,$c) {
    $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,13));
    $b -= $c; $b -= $a; $b ^= ($a<<8);
    $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,13));
    $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,12));
    $b -= $c; $b -= $a; $b ^= ($a<<16);
    $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,5));
    $a -= $b; $a -= $c; $a ^= ($this->zeroFill($c,3));   
    $b -= $c; $b -= $a; $b ^= ($a<<10);
    $c -= $a; $c -= $b; $c ^= ($this->zeroFill($b,15));
    return array($a,$b,$c);
  }

/** converts a string into an array of integers containing the numeric value of the char */
  function strord($pStr) {
    $vResult = array();
    for($i=0;$i<strlen($pStr);$i++) {
      $vResult[$i] = ord($pStr{$i});
      } // rof
    return $vResult;
  }

function GoogleCH($url,$length=null,$init=0xE6359A60) {
    if(is_null($length)) {
      $length = sizeof($url);
    } // fi

$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 = $this->mix($a,$b,$c);
      $a = $mix[0]; $b = $mix[1]; $c = $mix[2];
      $k += 12;
      $len -= 12;
    } // rof

$c += $length;
    switch($len) {
      case 11: $c+=($url[$k+10]<<24);
      case 10: $c+=($url[$k+9]<<16);
      case 9 : $c+=($url[$k+8]<<8);
      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 */
    } // esac

$mix = $this->mix($a,$b,$c);
    return $mix[2];
  }
}
?>

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At 1:05 PM, trungson said...: This post has been removed by a blog administrator.

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Google PageRank PHP5 Class

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