<?php

$i = 0;
define('_DATE_INVALID', $i++);
define('_DATE_MISSING', $i++);
define('_DATE_INVALID_MONTH', $i++);
define('_DATE_INVALID_DAY', $i++);
define('_DATE_INVALID_HOUR', $i++);
define('_DATE_INVALID_MINUTE', $i++);
define('_DATE_INVALID_SECOND', $i++);
$_DATE_MSGS = array(_DATE_INVALID => 'Invalid date format',
                    _DATE_MISSING => 'Missing date',
                    _DATE_INVALID_MONTH => 'Invalid month',
                    _DATE_INVALID_DAY => 'Invalid day',
                    _DATE_INVALID_HOUR => 'Invalid hour',
                    _DATE_INVALID_MINUTE => 'Invalid minute',
                    _DATE_INVALID_SECOND => 'Invalid second',
                    );

function validate_date(&$field) {
  $error = array();
  if (!$field) {
    $error[] = _DATE_MISSING;
  } else {
    if (preg_match('#^(((\d{4})[-/])?(\d\d?)[-/](\d\d?) +)?(\d\d?):(\d\d?)(:(\d\d?))?$#i', $field, $matches)) {
      /* help the user a bit */
      if (empty($matches[1])) { /* no date part, add today */
        $field = date('Y-m-d ') . $field;
        $matches[4] = date('m');
        $matches[5] = date('d');
      } elseif (empty($matches[2])) { /* year missing, add it */
        $field = date('Y-') . $field;
      }
      if (intval($matches[4]) > 12 || intval($matches[4]) < 1) { /* check month */
        $error[] = _DATE_INVALID_MONTH;
      }
      if (intval($matches[5]) > 31 || intval($matches[5]) < 1) { /* check day */
        $error[] = _DATE_INVALID_DAY; 
      }
      if (intval($matches[6]) < 0 || intval($matches[6]) > 23) { /* check hour */
        $error[] = _DATE_INVALID_HOUR;
      }
      if (intval($matches[7]) < 0 || intval($matches[7]) > 59) { /* check hour */
        $error[] = _DATE_INVALID_MINUTE;
      }
      if (intval($matches[8]) < 0 || intval($matches[8]) > 59) { /* check hour */
        $error[] = _DATE_INVALID_SECOND;
      }
    } else {
      $error[] = _DATE_INVALID;
    }
  }
  return ( (count($error) == 0) ? true : $error);
}

function validate_tags($field) {
  $error = array();
  if (!$field) {
    $error[] = 0;
  }
  return ( (count($error) == 0) ? true : $error);
}

function check_error($validCode) {
  foreach ($validCode as $key => $value) {
    if ($value !== true) {
      return false;
    }
  }
  return true;
}

?>