DUPLICATE ENTRY Error----FORM submission----PLEASE HELP ME, PLEASE!

[LadyInPurple]

Here is my NEW file:

/ Validation /

function check_field1($reference)
{
if(!preg_match("/[^{a-zA-Z0-9.-\Ä\ä\Ö\ö\Ü\ü\}
]+$/s",$reference))
return TRUE;
else
return FALSE;
}

function check_field2($amount)
{
if(!preg_match("/[^0-9\ ]+$/",$amount))
return TRUE;
else
return FALSE;
}

function check_field3($name)
{
if(!preg_match("/[^0-9]+$/ ",$name))
return TRUE;
else
return FALSE;
}

function check_field4($cardtype)
{
if(!preg_match("/[^0-9]+$/ ",$cardtype))
return TRUE;
else
return FALSE;
}

function check_field5($cardnumber)
{
if(!preg_match("/[^0-9]+$/ ",$cardnumber))
return TRUE;
else
return FALSE;
}

function check_field6($exp)
{
if(!preg_match("/[^0-9]+$/ ",$exp))
return TRUE;
else
return FALSE;
}

function check_field7($cvc2)
{
if(!preg_match("/[^0-9]+$/ ",$cvc2))
return TRUE;
else
return FALSE;
}

function check_field8($ssn)
{
if(!preg_match("/[^0-9]+$/ ",$ssn))
return TRUE;
else
return FALSE;
}

function check_field9($address)
{
if(!preg_match("/[^0-9]+$/ ",$address))
return TRUE;
else
return FALSE;
}

function check_field10($city)
{
if(!preg_match("/[^0-9]+$/ ",$city))
return TRUE;
else
return FALSE;
}

function check_field11($state)
{
if(!preg_match("/[^0-9]+$/ ",$state))
return TRUE;
else
return FALSE;
}

function check_field12($zip)
{
if(!preg_match("/[^0-9]+$/ ",$zip))
return TRUE;
else
return FALSE;
}

function check_field13($email)
{
if(!preg_match("/[^0-9]+$/ ",$email))
return TRUE;
else
return FALSE;
}

function check_field14($phone)
{
if(!preg_match("/[^0-9]+$/ ",$phone))
return TRUE;
else
return FALSE;
}

/ Validation /

$error=0; // check up variable

/ get it checking /

if(!check_field1($reference))
{
echo "Illegal input $reference in 'Reference'";
$error++; // $error=$error+1;
}
if(!check_field2($amount))
{
echo "Illegal input $amount in 'Amount'";
$error++;
}
if(!check_field3($name))
{
echo "Illegal input $name in 'Name'";
$error++;
}

if(!check_field4($cardtype))
{
echo "Illegal input $cardtype in 'Cardtype'";
$error++; // $error=$error+1;
}

if(!check_field5($cardnumber))
{
echo "Illegal input $cardnumber in 'Cardnumber'";
$error++; // $error=$error+1;
}

if(!check_field6($exp))
{
echo "Illegal input $exp in 'Exp'";
$error++; // $error=$error+1;
}

if(!check_field7($cvc2))
{
echo "Illegal input $cvc2 in 'CVC2'";
$error++; // $error=$error+1;
}

if(!check_field8($ssn))
{
echo "Illegal input $ssn in 'SSN'";
$error++; // $error=$error+1;
}

if(!check_field9($address))
{
echo "Illegal input $address in 'Address'";
$error++; // $error=$error+1;
}

if(!check_field10($city))
{
echo "Illegal input $city in 'City'";
$error++; // $error=$error+1;
}

if(!check_field11($state))
{
echo "Illegal input $state in 'State'";
$error++; // $error=$error+1;
}

if(!check_field12($zip))
{
echo "Illegal input $zip in 'Zip'";
$error++; // $error=$error+1;
}

if(!check_field13($email))
{
echo "Illegal input $email in 'Email'";
$error++; // $error=$error+1;
}

if(!check_field14($phone))
{
echo "Illegal input $phone in 'Phone'";
$error++; // $error=$error+1;
}

if(!check_field15($initals))
{
echo "Illegal input $initals in 'Initals'";
$error++; // $error=$error+1;
}

?>

But it's still NOT validating that the form has information in the fields!

I don't know what to do.....

When I submit a blank form it still posts and says

Your Information Has Been AddedDuplicate entry '' for key 1

[NogDog]

Please use

 tags instead of [QUOTE] tags around your code samples.

Again, please don't beg for answers: we already know that you are posting here because you want an answer. It goes without saying that it is important to you. That does not mean it's more or less important than anyone else's question here.

Anyway, your various check_field functions all appear to be checking if any "illegal" characters were entered, but none of them appear to check for no characters being entered. You could simply add an additional check for empty() or an empty string:
[code=php]
if(!empty($amount) and !preg_match("/[^0-9\ ]+$/",$amount))

...or, if 0 (zero) is a valid entry:

if(trim($amount) !== "" and !preg_match("/[^0-9\ ]+$/",$amount))