hmac encryption

<?php
$output = hash_hmac('ripemd160', 'The quick brown fox jumped over the lazy dog.', 'secret');
return $output;

<?php

$api_key = "1234AbCD";
function get_verification($var_name, $var_val
ue, $var_code) {
    global $api_key;
        $encodingval = htmlspecialchars($var_
code) . htmlspecialchars($var_name) . htmlspe
cialchars($var_value);
        return '||'.hash_hmac('sha256', $enco
dingval, $api_key).($var_value == "--OPEN--" 
? "||open" : "");
}

$name = get_verification('name', 'My Widget',
 'mycode');
$code = get_verification('code', 'mycode', 'm
ycode');
$price = get_verification('price', '1.99', 'm
ycode');

echo $name;
echo "<br />";
?>

$api_key = "1234AbCD";

function get_verification($var_name, $var_value, $var_code, $api_key) {
    $encodingval = htmlspecialchars($var_code) . htmlspecialchars($var_name) . htmlspecialchars($var_value);
    return '||'.hash_hmac('sha256', $encodingval, $api_key).($var_value == "--OPEN--" ? "||open" : "");
}

$name = get_verification('name', 'My Widget', 'mycode', $api_key);
$code = get_verification('code', 'mycode', 'mycode', $api_key);
$price = get_verification('price', '1.99', 'mycode', $api_key);
 
return $name;