Help with extracting URLs with php

Of course you can just type that url in hexadecimal, base64, md5 or whatever and then capture it and send it to that link, with php you would do something like this, I look at the links that I will use and the encoding of them is not real , the page is called id.php, variable to rescue url ..

<?php 
    // id.php?url=ahjhgfdadk==
    $url = $_GET['url'];
    $url = base64_decode($url);
    header('LOCATION:'.$url);
?>

with that, but for that you would have to have the absolute link of the video Ojo the coding of the url is optional is just a guide, of course also afterwards you would have to check if that variable exists so that can not be made directly to the URL of the page (it is also optional)

Example: $name = alphaID(microtime(true) * 10000);

$name is for in the name of the post as I use it plus the user ID or the date with Time(); to avoid two identical IDs link

Function alphaID

function alphaID($in, $to_num = false, $pad_up = false, $pass_key = null)
{
    $out   =   '';
    $index = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $base  = strlen($index);

    if ($pass_key !== null) {
        // Although this function's purpose is to just make the
        // ID short - and not so much secure,
        // with this patch by Simon Franz (http://blog.snaky.org/)
        // you can optionally supply a password to make it harder
        // to calculate the corresponding numeric ID

        for ($n = 0; $n < strlen($index); $n++) {
            $i[] = substr($index, $n, 1);
        }

        $pass_hash = hash('sha256',$pass_key);
        $pass_hash = (strlen($pass_hash) < strlen($index) ? hash('sha512', $pass_key) : $pass_hash);

        for ($n = 0; $n < strlen($index); $n++) {
            $p[] =  substr($pass_hash, $n, 1);
        }

        array_multisort($p, SORT_DESC, $i);
        $index = implode($i);
    }

    if ($to_num) {
        // Digital number  <<--  alphabet letter code
        $len = strlen($in) - 1;

        for ($t = $len; $t >= 0; $t--) {
            $bcp = bcpow($base, $len - $t);
            $out = $out + strpos($index, substr($in, $t, 1)) * $bcp;
        }

        if (is_numeric($pad_up)) {
            $pad_up--;

            if ($pad_up > 0) {
                $out -= pow($base, $pad_up);
            }
        }
    } else {
        // Digital number  -->>  alphabet letter code
        if (is_numeric($pad_up)) {
            $pad_up--;

            if ($pad_up > 0) {
                $in += pow($base, $pad_up);
            }
        }

        for ($t = ($in != 0 ? floor(log($in, $base)) : 0); $t >= 0; $t--) {
            $bcp = bcpow($base, $t);
            $a   = floor($in / $bcp) % $base;
            $out = $out . substr($index, $a, 1);
            $in  = $in - ($a * $bcp);
        }
    }

    return $out;
}

File notes:

/**
 * Translates a number to a short alhanumeric version
 *
 * Translated any number up to 9007199254740992
 * to a shorter version in letters e.g.:
 * 9007199254740989 --> PpQXn7COf
 *
 * specifiying the second argument true, it will
 * translate back e.g.:
 * PpQXn7COf --> 9007199254740989
 *
 * this function is based on any2dec && dec2any by
 * fragmer[at]mail[dot]ru
 * see: http://nl3.php.net/manual/en/function.base-convert.php#52450
 *
 * If you want the alphaID to be at least 3 letter long, use the
 * $pad_up = 3 argument
 *
 * In most cases this is better than totally random ID generators
 * because this can easily avoid duplicate ID's.
 * For example if you correlate the alpha ID to an auto incrementing ID
 * in your database, you're done.
 *
 * The reverse is done because it makes it slightly more cryptic,
 * but it also makes it easier to spread lots of IDs in different
 * directories on your filesystem. Example:
 * $part1 = substr($alpha_id,0,1);
 * $part2 = substr($alpha_id,1,1);
 * $part3 = substr($alpha_id,2,strlen($alpha_id));
 * $destindir = "/".$part1."/".$part2."/".$part3;
 * // by reversing, directories are more evenly spread out. The
 * // first 26 directories already occupy 26 main levels
 *
 * more info on limitation:
 * - http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/165372
 *
 * if you really need this for bigger numbers you probably have to look
 * at things like: http://theserverpages.com/php/manual/en/ref.bc.php
 * or: http://theserverpages.com/php/manual/en/ref.gmp.php
 * but I haven't really dugg into this. If you have more info on those
 * matters feel free to leave a comment.
 *
 * The following code block can be utilized by PEAR's Testing_DocTest
 * <code>
 * // Input //
 * $number_in = 2188847690240;
 * $alpha_in  = "SpQXn7Cb";
 *
 * // Execute //
 * $alpha_out  = alphaID($number_in, false, 8);
 * $number_out = alphaID($alpha_in, true, 8);
 *
 * if ($number_in != $number_out) {
 *     echo "Conversion failure, ".$alpha_in." returns ".$number_out." instead of the ";
 *     echo "desired: ".$number_in."\n";
 * }
 * if ($alpha_in != $alpha_out) {
 *     echo "Conversion failure, ".$number_in." returns ".$alpha_out." instead of the ";
 *     echo "desired: ".$alpha_in."\n";
 * }
 *
 * // Show //
 * echo $number_out." => ".$alpha_out."\n";
 * echo $alpha_in." => ".$number_out."\n";
 * echo alphaID(238328, false)." => ".alphaID(alphaID(238328, false), true)."\n";
 *
 * // expects:
 * // 2188847690240 => SpQXn7Cb
 * // SpQXn7Cb => 2188847690240
 * // aaab => 238328
 *
 * </code>
 *
 * @author    Kevin van Zonneveld <[email protected]>
 * @author    Simon Franz
 * @author    Deadfish
 * @author  SK83RJOSH
 * @copyright 2008 Kevin van Zonneveld (http://kevin.vanzonneveld.net)
 * @license   http://www.opensource.org/licenses/bsd-license.php New BSD Licence
 * @version   SVN: Release: $Id: alphaID.inc.php 344 2009-06-10 17:43:59Z kevin $
 * @link    http://kevin.vanzonneveld.net/
 *
 * @param mixed   $in   String or long input to translate
 * @param boolean $to_num  Reverses translation when true
 * @param mixed   $pad_up  Number or boolean padds the result up to a specified length
 * @param string  $pass_key Supplying a password makes it harder to calculate the original ID
 *
 * @return mixed string or long
 */