сколько могут стоить такие скрипты как у prsearch.net?

Так у них и спросите. :)

<?php

/*

This code is released unto the public domain

Raistlin Majere euclide@email.it

*/

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;

}

function get_pr($url) {

$result=array("",-1);

if (($url.""!="")&&($url.""!="http://")):

// check for protocol

if (substr(strtolower($url),0,7)!="http://"):

$url="http://".$url;

endif;

$url="info:".$url;

$checksum=GoogleCH(strord($url));

$google_url=sprintf("http://www.google.com/search?client=navclient-auto&ch=6%u&features=Rank&q=".$url,$checksum); // url to get from google

$contents="";

// let's get ranking

// this way could cause problems because the Browser Useragent is not set...

if ($handle=fopen($google_url,"rb")):

while(true):

$data=fread($handle,8192);

if (strlen($data)==0):

break;

endif;

$contents.=$data;

endwhile;

fclose($handle);

else:

$contents="Connection unavailable";

endif;

$result[0]=$contents;

// Rank_1:1:0 = 0

// Rank_1:1:5 = 5

// Rank_1:1:9 = 9

// Rank_1:2:10 = 10 etc

$p=explode(":",$contents);

if (isset($p[2])):

$result[1]=$p[2];

endif;

endif;

return $result;

}

// GET IT !

//$pr=get_pr($_GET["url"]);

//$output=$pr[0];

//$pagerank=$pr[1];

?>

Сорри, не вчитался внимательно в вопрос :D

Но если надо, то могу вам дописать все что вас требуется на PHP/Perl...