Determines if SSL is used.

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Returns true if the page is using SSL (checks if HTTPS or on Port 443).

NB: this won’t work for websites behind some load balancers, especially Network Solutions hosted websites. To body up a fix, save this gist into the plugins folder and enable it. For details, read WordPress is_ssl() doesn’t work behind some load balancers.

Websites behind load balancers or reverse proxies that support HTTP_X_FORWARDED_PROTO can be fixed by adding the following code to the wp-config.php file, above the require_once call:

if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')
$_SERVER['HTTPS'] = 'on';

Source

function is_ssl() {
	if ( isset( $_SERVER['HTTPS'] ) ) {
		if ( 'on' === strtolower( $_SERVER['HTTPS'] ) ) {
			return true;
		}

		if ( '1' === (string) $_SERVER['HTTPS'] ) {
			return true;
		}
	} elseif ( isset( $_SERVER['SERVER_PORT'] ) && ( '443' === (string) $_SERVER['SERVER_PORT'] ) ) {
		return true;
	}

	return false;
}

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