how to change url in all website in wordpress code example

Example 1: change site url wordpress database

options table
1. siteurl
2. home

######## OR ########

// Add to top of wp-config.php
define( 'WP_HOME', 'http://example.com' );
define( 'WP_SITEURL', 'http://example.com' );

Example 2: update url wordpress

<?php
update_option( 'siteurl', 'http://example.com' );
update_option( 'home', 'http://example.com' );