<?php
/** DomDNS
    @package domdns
    @author Dominique Fournier <dominique@fournier38.fr> */

/** Permit to check the validity of fields */
class verify
{
  /////////////////
  //   NETWORK   //
  /////////////////
  /** Check if $val is a valid IPv4
      Return TRUE or FALSE */
  public function is_ipv4 ($val)
  {
    if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4))
      return TRUE;
    return FALSE;
  }

  /** Check if $val is a valid IPv6
      Return TRUE or FALSE */
  public function is_ipv6 ($val)
  {
    if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6))
      return TRUE;
    return FALSE;
  }

  ///////////////
  //   DATES   //
  ///////////////
  /** Check if $val is a valid date
      A valid date is 2014-03-20 12:27:34
      Return TRUE or FALSE */
  public function is_datetimeSQL ($val)
  {
    if (strlen ($val) !== 19)
      return FALSE;
    $arr = date_parse ($val);
    if ($arr["warning_count"] !==0)
      return FALSE;
    if ($arr["error_count"] !==0)
      return FALSE;
    if (isset ($arr["tz_abbr"]))
      return FALSE;
    if (strspn ($val, "0123456789 :-") !== strlen ($val))
      return FALSE;
    return TRUE;
  }

  /////////////////
  //   NUMBERS   //
  /////////////////
  /** Return TRUE if the provided value is an integer in decimal (not octal) */
  public function is_integer ($val)
  {
    if (strspn ($val, "0123456789") !== strlen ($val))
      return FALSE;
    return TRUE;
    
  }
}