Parameter Encoder and Hasher

gistfile1.php

<?php
/**
 * @param array  $parameters
 * @param string $secretKey
 *
 * @return string
 *
 * @throws InvalidArgumentException
 */
function prepareParameters(array $parameters, $secretKey)
{
    // Verify a secret key was passed
    if (empty($secretKey)) {
        throw new InvalidArgumentException('Secret Key is required!');
    }

    // Encode parameters
    $parameters = json_encode($parameters, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);

    // Generate hash
    $hash = sha1($secretKey . $parameters);

    // Generate and return token
    return base64_encode($hash . '|' . $parameters);
}

/**
 * @param string $token     Token created by prepareParameters()
 * @param string $secretKey Secret key used when creating token
 *
 * @return array|false
 *
 * @throws InvalidArgumentException
 */
function retrieveParameters($token, $secretKey)
{
    // Verify a secret key was passed
    if (empty($secretKey)) {
        throw new InvalidArgumentException('Secret Key is required!');
    }

    // Parse and extract parameters
    $parts = explode('|', base64_decode($token), 2);
    if (count($parts) !== 2) {
        return false;
    }
    $hash = $parts[0];
    $parameters = $parts[1];

    // Check hash
    if ($hash !== sha1($secretKey . $parameters)) {
        return false;
    }

    // Return decoded parameters
    return json_decode($parameters, true, 512, JSON_BIGINT_AS_STRING);
}