Correction of WP Engine GeoIP example code on http://wpengine.com/support/geoip-personalizing-content-based-geography/ (taken from the geoip.php file of the plugin itself)

geoip.php

<?php

function geoip_append_content( $content ) {
	$geo = WPEngine\GeoIp::instance();
	$content .= "How's the weather in {$geo->city()}, {$geo->region()} {$geo->country()}?<br /><br />";
	return $content;
}
add_filter( 'the_content', 'geoip_append_content' );