PHP Google pagerank chart generator
November 3rd, 2005 by 
paolo Author: Paolo Ardoino
PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page’s value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves “important” weigh more heavily and help to make other pages “important”. by Google
PR(A) = (1 – d) + d (PR(T1) / C(T1) + … + PR(Tn) / C(Tn))
PR(A): Pagerank of a page A
d = 0.85
PR(Ti): Pagerank of page Ti which links to A
C(Ti): number of outbound links on page Ti, which has given the link Average Links per Page = 40
| PR | Start | For PR4 | For PR5 | For PR6 | For PR7 | For PR8 |
| PR 1 | 6 | 2050.5 | 11278 | 62030 | 341163 | 1876389 |
| PR 2 | 30 | 384.45 | 2115 | 11631 | 63968 | 351823 |
| PR 3 | 166 | 69.90 | 384.49 | 2115 | 11631 | 63968 |
| PR 4 | 915 | 12.70 | 69.88 | 384.37 | 2114 | 11627 |
| PR 5 | 5033 | 2.31 | 12.70 | 69.88 | 384.36 | 2114 |
| PR 6 | 27681 | 0.42 | 2.31 | 12.70 | 69.88 | 384.37 |
| PR 7 | 152244 | 0.07 | 0.42 | 2.31 | 12.70 | 69.89 |
| PR 8 | 837379 | 0.01 | 0.07 | 0.42 | 2.31 | 12.71 |
| PR 9 | 4605367 | 0.00 | 0.01 | 0.07 | 0.42 | 2.31 |
| PR 10 | 25329516 | 0.0005 | 0.003 | 0.014 | 0.076 | 0.42 |
The following PHP script generates a simple chart that could be usefull to know how many links are needed
to increase pagerank; it takes script taking average links per page as parameter
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | // Google PageRank chart generator by <strong>Paolo Ardoino</strong> [paolo@involutive.com] if($_POST["chpral"]) { $pral = $_POST["pral"]; } else { $pral = 40; } $prm = 0.85; $prlog = 5.5;for($i = 0; $i <= 9; $i++) { $prstart[$i] = round(pow(5.5, $i+1)); $prend[$i] = round(pow(5.5, $i+1+0.99)); $prmed[$i] = ($prstart[$i] + $prend[$i] / 2) * $prm; $prmedal[$i] = $prmed[$i] / $pral; } ?> <form action="googleprchart.php" method="post"> <table align="center"><tbody> <tr> <td>Average Links per Page <input name="pral" size="3" value="<?=$pral;?>" type="text" /> <input name="chpral" value="Rebuild" type="submit" /></td> </tr> </tbody></table> </form> <table align="center"><tbody> <tr> <td>PR</td> <td>Start</td> <td>For PR4</td> <td>For PR5</td> <td>For PR6</td> <td>For PR7</td> <td>For PR8</td> </tr> for($i = 0, $y = 1; $i <= 9; $i++, $y++) { echo " <tr> <td>PR ".$y."</td> <td>".$prstart[$i]."</td> <td>".round($prstart[3]/$prmedal[$i], 4)."</td> <td>".round($prstart[4]/$prmedal[$i], 4)."</td> <td>".round($prstart[5]/$prmedal[$i], 4)."</td> <td>".round($prstart[6]/$prmedal[$i], 3)."</td> <td>".round($prstart[7]/$prmedal[$i], 2)."</td> </tr> "; } ?> </tbody></table> |
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