speed.php

<?php

require 'vendor/autoload.php';

use Base32\Base32;

function generateRandomString($length = 10)
{
    $characters       = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString     = '';

    for ($i = 0; $i < $length; $i ++)
    {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }

    return $randomString;
}

function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());

    return ((float) $usec + (float) $sec);
}

$items = [];

for ($i = 0; $i < 100000; $i ++)
{
    $items[] = generateRandomString(rand(1, 20));
}

$start = microtime_float();

for ($i = 0; $i < 100000; $i ++)
{
    $e = Base32::encode($items[$i]);
    $d = Base32::decode($e);
}

$duration = microtime_float() - $start.PHP_EOL;

echo $duration;

// master
// 8.2193100452423
// 8.3363120555878
// 8.4401090145111
// 8.1804580688477
// 8.5243360996246

// alphabet
// 8.4657269668579
// 8.5485459613889
// 8.2104909515381
// 8.5630060100555
// 8.5397568893433