[PHP] var check not working...

[Jas]

For some reason this will not work... my $_POST variables check for no 
form variables and display a form... if they choose an item from a 
select box it queries the database for a field matching the $_post var 
and builds a new form creating 8 separate $_post variables to check 
for.. so far it works except when selecting an item from the select box 
it will only display the first form when there are $_post vars present. 
 I think I am missing something, could someone look over my code?
Thanks in advance,
Jas

function vlans_dhcp() {
$lvl = base64_decode($_SESSION['lvl']);
	if ($lvl != "admin") {
		$_SESSION['lvl'] = base64_encode($lvl);
		$_SESSION['msg'] = $dberrors[12];
		call_user_func("db_logs");
	} elseif ($lvl == "admin") {
		$_SESSION['lvl'] = base64_encode($lvl);
		if (($_POST == "") || (!isset($_POST['dhcp_vlans'])) || 
(!isset($_POST['sub'])) || (!isset($_POST['msk'])) || 
(!isset($_POST['dns01'])) || (!isset($_POST['dns02'])) || 
(!isset($_POST['rtrs'])) || (!isset($_POST['vlans']))) {
			create 1st form with dhcp_vlans as $_post var....;
		} elseif (($_POST != "") || (isset($_POST['dhcp_vlans'])) || 
($_POST['dhcp_vlans'] != "--------------") || (!isset($_POST['sub'])) || 
(!isset($_POST['msk'])) || (!isset($_POST['dns01'])) || 
(!isset($_POST['dns02'])) || (!isset($_POST['rtrs'])) || 
(!isset($_POST['vlans']))) {
			create 2nd form based on dhcp_vlans $_post var and create 8 different 
$_post vars...;
		} elseif (($_POST != "") || (!isset($_POST['dhcp_vlans'])) || 
(isset($_POST['id'])) || (isset($_POST['sub'])) || 
(isset($_POST['msk'])) || (isset($_POST['dns01'])) || 
(isset($_POST['dns02'])) || (isset($_POST['rtrs'])) || 
(isset($_POST['rnge'])) || (isset($_POST['vlans']))) {
			now put 8 $_post vars in database...;
		} else {
			$_SESSION['lvl'] = base64_encode($lvl);
			header("Location: help.php"); }
	} else {
		$_SESSION['lvl'] = base64_encode($lvl);
		$_SESSION['msg'] = $dberrors[12];
		call_user_func("db_logs"); }
}

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