A WordPress site with more than one domain name / Parked domains

You can use a predefined constants that points to site URL.

(from Codex)

define('WP_SITEURL', 'http://example.com/wordpress');
define('WP_HOME',    'http://example.com/wordpress'); 

Small example

define('WP_SITEURL', 'http://'.$_SERVER['HTTP_HOST']);
define('WP_HOME',    'http://'.$_SERVER['HTTP_HOST']); 

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