algorithmurl

How do URL shortener calculate the URL key? How do they work?

How do URL shortener's like bit.ly calculate a random key for each link? What algorithm would I need to know to create my own?

Solution

  • So far I found the code from http://briancray.com/2009/08/26/free-php-url-shortener-script/

    function getShortenedURLFromID ($integer, $base = ALLOWED_CHARS)
{
    $length = strlen($base);
    while($integer > $length - 1)
    {
        $out = $base[fmod($integer, $length)] . $out;
        $integer = floor( $integer / $length );
    }
    return $base[$integer] . $out;
}

    and the more complex answer by Marcel J. mentioned above.