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It can be one or more of the following:

<?php print $GLOBALS['base_url']; // Set by drupal. print $_SERVER['HTTP_HOST']; // Set by apache. print $_SERVER['SERVER_NAME']; // Set by apache. 

You can also check the database with this query

SELECT * FROM variable WHERE value LIKE '%example.com%' 

where example.com is the domain; this is not guaranteed to be correct though.

It can be one or more of the following:

<?php print $GLOBALS['base_url']; // Set by drupal_settings_initialize() or settings.php. print $_SERVER['HTTP_HOST']; // Set by apache. print $_SERVER['SERVER_NAME']; // Set by apache. 

You can also check the database with this query

SELECT * FROM variable WHERE value LIKE '%example.com%' 

where example.com is the domain; this is not guaranteed to be correct though.

it is

<?php print $GLOBALS['base_url']; 

It can be one or more of the following:

<?php print $GLOBALS['base_url']; // Set by drupal. print $_SERVER['HTTP_HOST']; // Set by apache. print $_SERVER['SERVER_NAME']; // Set by apache. 

You can also check the database with this query

SELECT * FROM variable WHERE value LIKE '%example.com%' 

where example.com is the domain; this is not guaranteed to be correct though.

it is

<?php global $base_url; print $base_url 

it is

<?php print $GLOBALS['base_url'];