Simple authentication class. Does not handle permissions or anything like that. Just something put together real quick and dirty.

auth.php

<?php
/**
 * Auth
 *
 * Verifies authentication credentials
 *
 * @author Mark LaDoux <mark.ladoux@gmail.com>
 */

 class Auth
 {
   /**
    * Create new credentials.
    *
    * @access public
    * @param  string $email    email address for user.
    * @param  string $password password to hash.
    * @return array            Array of values to store in database.
    */
   public function create(string $email, string $password)
   {
     // Create a UTC Timestamp of now for the created field.
     $now = new DateTime;
     $now->setTimezone(new DateTimeZone("UTC"));
     $created = $now->format('Y-m-d H:i:s');

     // check inputs ( Will build better error handling later. )
     if (! filter_var($email, FILTER_VALIDATE_EMAIL)) {
       throw new \Exception("Error Processing Request: Invalid E-Mail address.", 1);
     }

     // Create password hash
     $hash = password_hash($password, PASSWORD_DEFAULT);

     return [
       'created'  => $now,
       'email'    => $email,
       'password' => $hash
     ];
   }

   /**
    * Verify password against stored hash.
    *
    * @access public
    * @param  string $password    cleartext password.
    * @param  string $stored_hash stored password hash.
    * @return array               results.
    */
   public function verify(string $password, string $stored_hash)
   {
     // check if passord needs rehash
     $rehash  = password_needs_rehash($stored_hash, PASSWORD_DEFAULT);
     $valid   = password_verify($password, $stored_hash);

     return [
       'rehash' => $rehash,
       'valid'  => $valid
     ];
   }

   /**
    * Create new password hash using current standards.
    *
    * @access public
    * @param  string $password cleartext password.
    * @return string           hashed password.
    */
   public function update(string $password)
   {
     return password_hash($password, PASSWORD_DEFAULT);
   }
 }