function stock_meta_box_callback() { echo '<p>Use these codes in email message copy to be replaced by variables.</p>'; echo '<p><strong>Activity Codes</strong></p>'; foreach (AC::get_activity_replacement_codes() as $code) { echo '<code>{{a_' . $code . '}}</code><br />'; } echo '<p><strong>Reservation Codes</strong></p>'; foreach (AC::get_reservation_replacement_codes() as $code) { echo '<code>{{r_' . $code . '}}</code><br />'; } echo '<p><strong>Waitlist Codes</strong></p>'; foreach (AC::get_waitlist_replacement_codes() as $code) { echo '<code>{{w_' . $code . '}}</code><br />'; } }