Remove placeholder texts in checkout fields

add_filter('woocommerce_default_address_fields', override_address_fields');
function override_address_fields( $address_fields ) {
  $address_fields['address_1']['placeholder'] = '';
  $address_fields['address_2']['placeholder'] = '';
  $address_fields['city']['placeholder'] = '';
  $address_fields['state']['placeholder'] = '';
  $address_fields['postcode']['placeholder'] = '';
  return $address_fields;
}

More info and any fields I missed are here:
https://docs.woothemes.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/

Hi,
I put in in my functions file, however, the same thing happened: I could not view my site any longer! The same thing had happened with the code I used before. When I tried to view my page, it just shows a blank page…

There’s a typo in the example code, which would have caused a syntax error. The fix is to add a quote before override_address_fields:

REMOVE THIS
add_filter(‘woocommerce_default_address_fields’, override_address_fields’);

ADD THIS:
add_filter(‘woocommerce_default_address_fields’, ‘override_address_fields’);