Set WordPress site URL in the config file instead of the database

wp-config.php

<?php

// WordPress stores the site URL in the database by default (which I have never
// understood), and it's a pain to have to type out the UPDATE SQL or search in
// phpMyAdmin to change it. This is a simple way to put the URL into
// wp-config.php instead.

// Note that you will still need to update any URLs that appear in the content,
// especially when you copy a database from a development site to production:
// https://gist.github.com/davejamesmiller/a8733a3fbb17e0ff0fb5

//----------------------------------------

// Add these lines to wp-config.php:
define('WP_SITEURL', 'https://www.domain.com');
define('WP_HOME',    'https://www.domain.com');

//----------------------------------------

// Or add appropriate logic so it works on all servers:
if ($_SERVER['HTTP_HOST'] == 'dev.domain.com') {
    define('WP_SITEURL', 'http://dev.domain.com');
    define('WP_HOME',    'http://dev.domain.com');
} else {
    define('WP_SITEURL', 'https://www.domain.com');
    define('WP_HOME',    'https://www.domain.com');
}

//----------------------------------------

// Or you can use the current hostname automatically - but note that WordPress
// won't be able to redirect to the canonical domain for you
define('WP_SITEURL', 'https://' . $_SERVER['HTTP_HOST']);
define('WP_HOME',    'https://' . $_SERVER['HTTP_HOST']);

//----------------------------------------

// Or use .env files like Laravel does (you can also use it for database credentials)
// (Also run "composer require vlucas/phpdotenv")
require_once __DIR__ . '/../vendor/autoload.php';
$dotenv = new Dotenv\Dotenv(__DIR__ . '/..');
$dotenv->load();

define('WP_SITEURL', $_ENV['URL']);
define('WP_HOME',    $_ENV['URL']);