Cloudflare Flexible SSL for Wordpress

config.php

$https_options = array( 'HTTP_CF_VISITOR', 'HTTP_X_FORWARDED_PROTO' );
foreach ( $https_options as $https_option ) {
	if ( isset( $_SERVER[ $https_option ] ) 
	    && ( strpos( $_SERVER[ $https_option ], 'https' ) !== false ) 
	) {
		$_SERVER[ 'HTTPS' ] = 'on';
	}
}