Ссылка на профиль в стиме

<?php

$steam="STEAM_0:1:4275511";

echo("<a href=\"http://steamcommunity.com/profiles/".GetFriendID($steam)."\">Click</a>");

function GetFriendID($pszAuthID)
{
    $iServer = "0";
        $iAuthID = "0";
    
    $szAuthID = $pszAuthID;
    
    $szTmp = strtok($szAuthID, ":");
    
    while(($szTmp = strtok(":")) !== false)
        {
            $szTmp2 = strtok(":");
            if($szTmp2 !== false)
            {
                    $iServer = $szTmp;
                    $iAuthID = $szTmp2;
            }
        }
        if($iAuthID == "0")
               return false;
        
    $i64friendID = Mul(strval($iAuthID), "2");
    $i64friendID = Add(strval($i64friendID), Add("76561197960265728", strval($iServer)));
    return $i64friendID;
}

function Mul($Num1='0',$Num2='0') {
    // check if they're both plain numbers
    if(!preg_match("/^\d+$/",$Num1)||!preg_match("/^\d+$/",$Num2)) return(0);

    // remove zeroes from beginning of numbers
    for($i=0;$i<strlen($Num1);$i++) if(@$Num1{$i}!='0') {$Num1=substr($Num1,$i);break;}
    for($i=0;$i<strlen($Num2);$i++) if(@$Num2{$i}!='0') {$Num2=substr($Num2,$i);break;}

    // get both number lengths
    $Len1=strlen($Num1);
    $Len2=strlen($Num2);

    // $Rema is for storing the calculated numbers and $Rema2 is for carrying the remainders
    $Rema=$Rema2=array();

    // we start by making a $Len1 by $Len2 table (array)
    for($y=$i=0;$y<$Len1;$y++)
    for($x=0;$x<$Len2;$x++)
      // we use the classic lattice method for calculating the multiplication..
      // this will multiply each number in $Num1 with each number in $Num2 and store it accordingly
      @$Rema[$i++%$Len2].=sprintf('%02d',(int)$Num1{$y}*(int)$Num2{$x});

    // cycle through each stored number
    for($y=0;$y<$Len2;$y++)
        for($x=0;$x<$Len1*2;$x++)
            // add up the numbers in the diagonal fashion the lattice method uses
            @$Rema2[Floor(($x-1)/2)+1+$y]+=(int)$Rema[$y]{$x};

    // reverse the results around
    $Rema2=array_reverse($Rema2);

    // cycle through all the results again
    for($i=0;$i<count($Rema2);$i++) {
        // reverse this item, split, keep the first digit, spread the other digits down the array
        $Rema3=str_split(strrev($Rema2[$i]));
    for($o=0;$o<count($Rema3);$o++)
        if($o==0) @$Rema2[$i+$o]=$Rema3[$o];
        else @$Rema2[$i+$o]+=$Rema3[$o];
    }
    // implode $Rema2 so it's a string and reverse it, this is the result!
    $Rema2=strrev(implode($Rema2));

    // just to make sure, we delete the zeros from the beginning of the result and return
    while(strlen($Rema2)>1&&$Rema2{0}=='0') $Rema2=substr($Rema2,1);

    return($Rema2);
}

function Add($Num1,$Num2) {
    // check if they're valid positive numbers, extract the whole numbers and decimals
    if(!preg_match("/^\+?(\d+)(\.\d+)?$/",$Num1,$Tmp1)||
        !preg_match("/^\+?(\d+)(\.\d+)?$/",$Num2,$Tmp2)) return '0';

    // this is where the result is stored
    $Output=array();

    // remove ending zeroes from decimals and remove point
    $Dec1=isset($Tmp1[2])?rtrim(substr($Tmp1[2],1),'0'):'';
    $Dec2=isset($Tmp2[2])?rtrim(substr($Tmp2[2],1),'0'):'';

    // calculate the longest length of decimals
    $DLen=max(strlen($Dec1),strlen($Dec2));

    // remove leading zeroes and reverse the whole numbers, then append padded decimals on the end
    $Num1=strrev(ltrim($Tmp1[1],'0').str_pad($Dec1,$DLen,'0'));
    $Num2=strrev(ltrim($Tmp2[1],'0').str_pad($Dec2,$DLen,'0'));

    // calculate the longest length we need to process
    $MLen=max(strlen($Num1),strlen($Num2));

    // pad the two numbers so they are of equal length (both equal to $MLen)
    $Num1=str_pad($Num1,$MLen,'0');
    $Num2=str_pad($Num2,$MLen,'0');

    // process each digit, keep the ones, carry the tens (remainders)
    for($i=0;$i<$MLen;$i++) {
        $Sum=((int)$Num1{$i}+(int)$Num2{$i});
        if(isset($Output[$i])) $Sum+=$Output[$i];
            $Output[$i]=$Sum%10;
        if($Sum>9) $Output[$i+1]=1;
    }

    // convert the array to string and reverse it
    $Output=strrev(implode($Output));

    return($Output);
}
?>