删除此日期之前的下拉列表中的所有选项

I'm not much of a coder and I need to modify the following code to remove all options that are before today instead of just the 2 days in the array shown.

add_filter('frm_setup_new_fields_vars', 'remove_field_option', 30, 2);
add_filter('frm_setup_edit_fields_vars', 'remove_field_option', 30, 2);
function remove_field_option( $values, $field ) {
  if ( $field->id == 242 ) { 
    $timestamp = time();
    $options_to_remove = array( '2016-08-19', '2016-08-20' )
    foreach ( $options_to_remove as $remove ) {
      $option_key = array_search( $remove, $values['options'] );
      if ( $option_key !== false ) {
        unset( $values['options'][ $option_key ] );
      }
    }
  }
  return $values;
}

if you want to go with your way using $options_remove array

$newArray = array_filter($oldArray,function($a) {
global $options_remove;
return !in_array($a,$options_remove);
});

OR something like this

$today  = mktime(0, 0, 0, date("m")  , date("d"), date("Y"));
 $newArray = array_filter($oldArray,function($a) {
// your old array assumed to hold the date or datetime as value such as '2016-08-11' or '2016-08-11 08:11:23'  
global $today;
return strtotime($a) < $today;
});

$newarray holds value for time less than start of today. so until end of yesterday