<?
//check for a safe username
function safeuname($name)
{
	if (strlen($name) < 2) return FALSE;
	return ereg("^[a-z][a-z0-9_]*$", $name);
}
//check for a valid email address
function validEmail ($email)
{
	global $error;
	//split user and domain
	list($user,$domain) = explode("@", $email);
	// check for bad characters, and check for zero length user & domain
	if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$",$email) or !$user or !$domain )
	{
		$error = 'an invalid email address (syntax)';
		return false;
	}
	// Syntax OK
	
	// Check for an mail server
	elseif(!getmxrr($domain,$mx) or !gethostbyname($domain)) 
	{
		$error = "no mail servers listed for '$domain'";
		return false;
	}
	else 
	{
		// Email address valid from technical point of view
		return true;
	}
}

// Find out if a given user has a blog
function blogger ($user) {
	global $BlogDB;
	$result = $BlogDB->GetAll("select username from users where username='". $user ."'");
	if (count($result)>0) return true;
	else return false;
}

?>