y; if ( $years_diff === false ) return 0; return $years_diff; } function age_in_years_shortcodes_notice() { echo '

The Age Shortcodes plugin is not working because the shortcode [age] is already registered.

'; } function age_in_years_shortcodes_init() { if ( shortcode_exists( 'age' ) ) add_action( 'all_admin_notices', 'age_in_years_shortcodes_notice' ); else add_shortcode( 'age', 'age_in_years_shortcodes' ); } add_action( 'init', 'age_in_years_shortcodes_init' );