[Help needed to find multiple values in a row]

id should automaticaly generate  mysql

u should make ur `userid` like that

create `sometable` (
`userID`smallint(5) NOT NULL auto_increment,
... some other fields ... ,
PRIMARY KEY  (`userID`) 
)

then when u will run

mysql_query("INSERT INTO users ( email, password, mobile)
                                VALUES ('$email','$password','$mobile')");

id will be 1 , next accaunt will have 2 , then 3 ... 99999

[Cart sessions]

wtf is it ?

if(!isset($_SESSION['cart'] = $new))
#php makes ur code step by step 
#first step
$_SESSION['cart'] = $new
#where is $new variable ?
#if no varable $_SESSION['cart'] will be null
#then we check
if (!isset(null))
#its true
if (true)
$_SESSION['cart'] = $new;
#and again $_SESSION['cart'] will be null

where is declarated $new variable ?

[PHP ['uid'] Errors]

ur $_SESSION['uid'] doesn't isset , u should check it

<?php
session_start();
mysql_connect("localhost","root","");
mysql_select_db("news_system");
        if (!isset($_SESSION['uid'])) $_SESSION['uid'] = null;

[Performance improvment]

OMG 

for ($i=1 ; !($i > 12) ; $i++)
{
${'checkmatch'.$i} = isset($_SESSION['match'.$i]) ?  $_SESSION['match'.$i] : 0;
}

[Header Already Sent...]

u make output

 

echo "<p>logged in as: ". $_SESSION['login'];

then u are using header in ur function

try to replace them

session_start();
if(isset($_SESSION['login']) && isset($_SESSION['password'])) {
	checkdate();
	include ('header.php');		
	echo "<p>logged in as: ". $_SESSION['login'];			
	include ('footer.php');

	}
...