<!-- Collection of code snippets by Arne Vajhøj -->
<!-- from articles on eksperten.dk / vajhoej.dk (2004-now) -->
<?php

// hash: binary -> binary
function myhash($alg, $content) {
    return hash($alg, $content, true);    
}

// Base64 encode: binary -> text
function encode($b) {
    return base64_encode($b);
}

// hash: text -> Base64 text 
function hash_encode($alg, $content) {
    return encode(myhash($alg, $content));
}

// test
define('TEXT', 'This is some random text to be used to test encryption.');

function test($label, $alg) {
    echo $label . ":\r\n";
    $hashval = hash_encode($alg, TEXT);
    echo '  ' . $hashval . "\r\n";
    $hashval2 = hash_encode($alg, TEXT . TEXT);
    echo '  ' . $hashval2 . "\r\n";
}

function test2() {
    if(hash_encode('SHA256', TEXT) != 'oJM3t4y26uLCLtiLLNP8bhZuZi24znFEdB+QnM2d0w4=') {
        echo 'Ooops';
    }
}

test('SHA-2 256 bit', 'SHA256');
test('SHA-2 384 bit', 'SHA384');
test('SHA-2 512 bit', 'SHA512');
//test('SHA-3 256 bit', 'SHA3-256'); // require PHP 7.1+
//test('SHA-3 384 bit', 'SHA3-384'); // require PHP 7.1+
//test('SHA-3 512 bit', 'SHA3-512'); // require PHP 7.1+
test2();
?>