Help With PHP Error

[soft2050]

mysql_fetch_array - Returns an array that corresponds to the fetched row and moves the internal data pointer ahead.
http://php.net/manual/en/function.mysql-fetch-array.php

Use mysql_num_rows to check whether the query returned any results or not:
http://php.net/manual/en/function.mysql-num-rows.php

<?php

if (isset($_POST["boxuser"]) and isset($_POST["boxpass"])) { // use checks to prevent from direct page access

$con= mysql_connect("localhost","usermaster","") or die (mysql_error());
$cName= mysql_real_escape_string($_POST["boxuser"]); // prevent mysql injections
$cPass= mysql_real_escape_string($_POST["boxpass"]); // prevent mysql injections
mysql_select_db("mynewdb");
//$query = "select * from mytable where uname=".$cName."and upass=".$cPass;
$query = "SELECT * FROM mytable WHERE uname=$cName and upass=$cPass";
$result = mysql_query($query);
$row = mysql_num_rows($result);

if ($row > 0)
{
    echo "Login successful.";
}
else
{
    echo "Login failed.";
}
mysql_close();

} else {

    die('RETRY AGAIN FROM THE LOGIN PAGE');

}

?>

Use php's mysql_real_escape_string to prevent from mysql injections attacks - http://www.php.net/manual/en/functio...ape-string.php