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The site_url template tag retrieves the (admin/backend) site url for the current site (where the WordPress core files reside) with the appropriate protocol, 'https' if is_ssl() and 'http' otherwise.

If scheme is 'http' or 'https', is_ssl() is overridden. Use this to get the "WordPress address" as defined in general settings. Use home_url() to get the "site address" as defined in general settings.

In case of WordPress Network setup, use network_site_url() instead.

Usage:

<?php site_url( $path, $scheme ); ?>

Reference:

codex.wordpress.org

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