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<?php
/**
 * @author mircobabini
 * @uses get_avatar_url: https://gist.github.com/mircobabini/4d6e129789652e6ac06b
 * @requires https://wordpress.org/plugins/wp-user-avatar/
 */
function get_user_avatar_url( $user, $full = false ){
	$attachment_id = get_user_meta( $user->ID, 'wp_user_avatar', true );
	if( $attachment_id ){
		return ( $full ) ? 
			wp_get_attachment_url( $attachment_id ) :
			wp_get_attachment_thumb_url( $attachment_id );
	}

	return get_avatar_url( $user->ID );
}