Functions for my Form - Not sure if they are correct or not....

[kenwvs]

These are the functions that I am using in my form.  I am not sure if I have written them correctly or not, as I got the gist of it from a tutorial at another site, and then went out on my own.  If you want to browse and let me know where I have gone wrong that would be great.

I have a feeling this tutorial that is for form validation may not have taken the most direct route, so it may not look totally normal.

Thanks in advance,

Ken

[code]
<?php
function isDigits($element) {                      //numbers only
  return !preg_match ("/[^0-9]/", $element);
}
?>

<?php
function Dollars($element) {                        //numbers and decimal
  return !preg_match ("/[^0-9]./", $element);
}
?>

<?php
function isLetters($element) {                      //letters only
  return !preg_match ("/[^A-z]/", $element);
}
?>

<?php
function LetandNumOnly($element) {                  //Letters and Numbers
  return !preg_match ("/[^A-z0-9]/", $element);    //with No Spaces
}
?>

<?php
function LettersAndDigits($element) {              //Letters, Numbers
  return !preg_match ("/[^A-z0-9 ]/", $element);  //and Spaces
}
?>

<?php
function Variable($element) {                      //letters, numbers, spaces
  return !preg_match ("/[^A-z0-9,. ]/", $element);//commas and periods only
}
?>

<?php
function checkLength($string, $min, $max) {        //Check the Length
  $length = strlen ($string);                      //min and max
  if (($length < $min) || ($length > $max)) {
    return FALSE;
  } else {
    return TRUE;
  }
}
?>

<?php
function checkMailCode($code, $country) {          //Check Postal Code
  $code = preg_replace("/[\s|-]/", "", $code);      //by Country
  $length = strlen ($code);
  switch (strtoupper ($country)) {
    case 'US':
      if (($length <> 5) && ($length <> 9)) {
        return FALSE;
      }
      return isDigits($code);
    case 'CA':
      if ($length <> 6) {
        return FALSE;
      }
      return preg_match ("/([A-z][0-9]){3}/", $code);
  }
}
?>

<?php
function checkURL($url) {                          //check valid URL Format
  return preg_match ("/http:\/\/(.*)\.(.*)/i", $url);
}
?>

<?php
function checkURLandConnect($url) {                //Check Valid URL and
  if (!preg_match ("/http:\/\/(.*)\.(.*)/i", $url)) {//Confirm by Connecting
    return FALSE;
  }
  $parts = parse_url($url);
  $fp = fsockopen($parts['host'], 80, $errno, $errstr, 10);
  if(!$fp) {
    return FALSE;
  }
  fclose($fp);
  return TRUE;
}
?>

<?php
function checkEmail($email) {                      //Check Email Format
  $pattern = "/^[A-z0-9\._-]+"
        . "@"
        . "[A-z0-9][A-z0-9-]*"
        . "(\.[A-z0-9_-]+)*"
        . "\.([A-z]{2,6})$/";
  return preg_match ($pattern, $email);
}
?>

<?php
function EmailorEmpty($email) {                    //Check Email Format
    if(empty($email)) {                            //or empty field
        return true;
    } else {
        $pattern = "/^[A-z0-9\._-]+"
        . "@"
        . "[A-z0-9][A-z0-9-]*"
        . "(\.[A-z0-9_-]+)*"
        . "\.([A-z]{2,6})$/";
        return preg_match ($pattern, $email);
    }
}
?>

<?php
function checkPassword($password) {                //check password for minimum
  $length = strlen ($password);                    //of 8 characters and must
  if ($length < 8) {                                //have a number between letters
    return FALSE;                                  //and a variation of letters
  }
  $unique = strlen (count_chars ($password, 3));
  $difference = $unique / $length;
  echo $difference;
  if ($difference < .60) {
    return FALSE;
  }
  return preg_match ("/[A-z]+[0-9]+[A-z]+/", $password);
}
?>

<?php
function BidIncrement($bid)  {
$bid_increment = $_POST['bid_increment'];  //function for bid_increment only
$item_type = $_POST['item_type'];
if($item_type == "auction" or $item_type=="dutch auction")
{
if(!(is_numeric($bid_increment))
OR empty($bid_increment)){
  echo "You have not entered a valid Bid Increment";
  exit;
  }
  else{
  echo "Valid bid increment";
  }
}elseif($item_type == "fixed price" OR $item_type="classified"){
  if(!empty($bid_increment)){
    echo "Bid Increments are not valid for this type of Listing!";
}
}

?>

<?php
function ReservePrice($reserve)    {
$reserve_price = $_POST['reserve_price'];  //function for reserve_price only
$item_type = $_POST['item_type'];
if($item_type == "Auction" or $item_type=="Ddutch Auction")
{
if(!(is_numeric($reserve_price))
OR empty($reserve_price)){
  echo "You have not entered a Valid Reserve Bid or Starting Price";
  exit;
  }
  else{
  echo "Valid bid increment";
  }
}elseif($item_type == "Fixed Price" OR $item_type="Classified Ad"){
  if(!empty($reserve_price)){
    echo "A Reserve Bid or Starting Price cannot be entered for this auction type";
}
}

?>
<?php
function ItemCategory($category)    {          // Verify Valid Category
$item_category = $_POST['item_category'];
if($item_category == "000")//assumes you gave it the value 000
{
echo "Please select a valid category";
exit;
}
}
?>
[/code]