<?php

use Selective\Base32\Base32;

$str = 'abc 1234';

$base32 = new Base32();

// Encode
// MFRGGIBRGIZTI====
$encoded = $base32->encode($str);

// Decode
// abc 1234
echo $base32->decode($encoded); 

<?php

$str = 'abc 1234';

// Encode
$encoded = $base32->encode($str, false);

// mfrggibrgizti
$encoded = strtolower($enc); 

// Decode
echo $base32->decode($encoded);