filter_var Validate Filters Part 1

<?php

  /*
    Filter Functions

    - filter_var(Value[Required], Filter[Optional], Options[Optional])
    --- Validate Filters

    ------ FILTER_VALIDATE_BOOL => [True, 1, Yes, On]
    ---------- Flag => FILTER_NULL_ON_FAILURE => False For [False, 0, No, Off, ""] Only

    ------ FILTER_VALIDATE_URL
    ---------- Flag => FILTER_NULL_ON_FAILURE
    ---------- Flag => FILTER_FLAG_PATH_REQUIRED
    ---------- Flag => FILTER_FLAG_QUERY_REQUIRED

    ------ FILTER_VALIDATE_IP
    ---------- Flag => FILTER_NULL_ON_FAILURE
    ---------- Flag => FILTER_FLAG_IPV4
    ---------- Flag => FILTER_FLAG_IPV6

    ------ FILTER_VALIDATE_MAC
    ---------- Flag => FILTER_NULL_ON_FAILURE
  */

  $bool = "Elzero"; // True | 1 | "yes" | "on"

  var_dump(filter_var($bool, FILTER_VALIDATE_BOOL, FILTER_NULL_ON_FAILURE));

  echo "<br>";

  $url = "https://elzero.org/?id=100";

  var_dump(filter_var($url, FILTER_VALIDATE_URL,
  ["flags" => FILTER_NULL_ON_FAILURE | FILTER_FLAG_PATH_REQUIRED | FILTER_FLAG_QUERY_REQUIRED]));

  echo "<br>";

  $ip = "192.168.2.1";

  var_dump(filter_var($ip, FILTER_VALIDATE_IP, ["flags" => FILTER_NULL_ON_FAILURE | FILTER_FLAG_IPV6]));

  echo "<br>";

  $mac = "00:00:5e:00d:53:af";

  var_dump(filter_var($mac, FILTER_VALIDATE_MAC));