Very Simple Auth Helper

PHP Code:

<?php

    /*
        * Base Auth - Helper
        - register
        - login
        - logout
        
        * Table: ci_users
        - id
        - username
        - password_hash
    */

    function register($username, $password)
    {
        $db      = db_connect();
        $builder = $db->table('ci_users');
        $arrW    = ['username' => $username];
        $users   = $builder->getWhere($arrW, 1);
        if (count($users->getResult()) == 1) {
            return [
                'status' => false,
                'code'   => 'ExistUsername'
            ];
        }
        
        $arrA = [
            'username'      => $username,
            'password_hash' => hashPassword($password)
        ];
        $builder->insert($arrA);
        
        return [
            'status' => true,
            'code'   => 'Success'
        ];
    }
    
    function login($username, $password)
    {
        if (session()->appUID > 0) {
            return true;
        }
        
        $db      = db_connect();
        $builder = $db->table('ci_users');
        $arrW    = [
            'username'      => $username,
            'password_hash' => hashPassword($password)
        ];
        
        $users = $builder->getWhere($arrW, 1);
        if (count($users->getResult()) == 1) {
            $row = $users->getRow();
            session()->set([
                'appUID'     => $row->id,
                'appUSN'     => $username,
                'appIsAdmin' => ($username == 'admin' ? true : false)
            ]);
            
            return true;
        }
        
        return false;
    }
    
    function logout()
    {
        session()->remove([
            'appUID',
            'appUSN',
            'appIsAdmin'
        ]);
    }
    
    function users()
    {
        if (session()->appUID > 0) {
            $db      = db_connect();
            $builder = $db->table('ci_users');
            $arrW    = ['id' => session()->appUID];
            $users   = $builder->getWhere($arrW, 1);
            if (count($users->getResult()) == 1) {
                return $users->getRow();
            }
        }
        
        return null;
    }
    
    function hashPassword($string)
    {
        $aConf  = config('App');
        /*
            Example:
            $aConf->authKey = 'a#C';
            $aConf->authIv  = '@fB';
        */
        $pass   = false;
        $method = "AES-256-CBC";
        $key    = hash('sha256', $aConf->authKey);
        $iv     = substr(hash('sha256', $aConf->authIv), 0, 16);
        $pass   = base64_encode(openssl_encrypt($string, $method, $key, 0, $iv));

        return $pass;
    }
    
    function is_logged()
    {
        return (bool)session()->appUID;
    }
    
    function is_admin()
    {
        return session()->appIsAdmin;
    }
    
    function is_username()
    {
        return session()->appUSN;
    } 


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