my sql insert query not working

I am inserting userId.It is displaying correct but inserting 0 in spite of actual userId. mycode-

If(! empty($userIDToCheck) || $userIDToCheck != '' )
{
echo $userIDToCheck;  
$sql = "INSERT INTO `pnpdb`.`ruser` (`userid`) VALUES ('$userIDToCheck');";  
mysql_query($sql)开发者_StackOverflow中文版or die(mysql_error());  
echo "Done";  
}

Output : pi203713 Done

But is database it is inserting "0"???

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And what datatype is the userid column in ruser?

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Have you verified that your variable's value is not zero?

Perhaps there's an assignment mistake further up your code?

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Try this:

$sql = "INSERT INTO `pnpdb`.`ruser` (`userid`) VALUES ('".$userIDToCheck."');";