Disable field if field is not empty

• raphael

• October 13, 2022 at 10:41 am

If the user is not an administrator, I would like to disable a specific field.
I tried that:

function disable_acf_load_field( $field ) {
	if( !current_user_can( 'administrator' ) ) {
		if (get_field($field['name'], $my_post_id)!="") {
         	      $field['disabled'] = true;
		}
	}
	return $field;
}
add_filter('acf/load_field/name=my_field', 'disable_acf_load_field');

But I get a 500 internal server error!
It looks like I can’t use get_field() inside this load_field filter.

Do you have an idea on how I can get a readonly field if this field has a value already set?

Many thanks!