Get and parse blocked IPs

gistfile1.txt

$blocked = get_option('blacklist_keys');
$blocked = str_replace( "\r", "\n", $blocked );

$blocked_arr = explode( "\n", $blocked );
$blocked_arr = array_map('trim', $blocked_arr);

$final_blocked_arr = array();
foreach ($blocked_arr as $ip) {
  $ip = trim($ip);
  if ( filter_var( $ip, FILTER_VALIDATE_IP ) ) {
    $final_blocked_arr[] = $ip;
  }
}