Token.php

<?php
namespace App;

/* Token class to generate unique, random tokens */
/*
    $token = new \App\Token();
*/
class Token {

    /**
     * @var array 
     */
    protected $token;

    /**
     * MAGIC METHOD: __construct
     * @param void     :
     * @return void    : Run this code when a new instance of Token is created
     */
    public function __construct($token_value = null)//optional argument
    {
        if ($token_value) {
            // Set the value at index "token" for the calling Token object equal to the parameter
            $this->token = $token_value;
        } else {
            // Create a new token by generating random bytes and then converting binary to hex
            $this->token = bin2hex(random_bytes(16));
        }
    }

    /**
     * METHOD: getHash
     * @param void     :
     * @return string  : Return the hashed value of the token
     */
    public function getHash() {
        return hash_hmac('sha256',$this->token,\App\Config::HASH_KEY);//sha256 = 64 chars
    }

    /**
     * METHOD: getValue
     * @param void     :
     * @return string  : Return the current string saved at the $token index of the calling Token object
     */
    public function getValue() {
        return $this->token;
    }
}
?>