login.php

<?php
/* Game Engine: CrimeRPG v1.00
 * Engine Creator: NonStopCoding
 * Engine Programmer: NonStopCoding
 * Personal Contact Email: [email protected]
 * Layout Designer: DopeboyGFX AKA (Tyson Cruz)
 * Contact Email: [email protected]
 * Report Bugs / Glitches: [email protected]
 * Contact Sales Team: [email protected]
 * Contact Support: [email protected]
 * CrimeRPG is © nonstopcoding.com 2014
*/

include(__DIR__.'/connect.php');

# This function will clean the $_POST Data. #
function mres($str) {
    return mysql_real_escape_string($str);
}
# Function End #
if(isset($_POST['submit'])) {
    $username = mres(trim($_POST['username']));
    $password = md5(mres($_POST['password']));
    $res = mysql_query("SELECT * FROM `members` WHERE `username` = ".$_POST['username']);
    if(mysql_num_rows($res) == 1) {
        $error = "There is already a user with that username pick another.";
    }
    $row = mysql_fetch_array($res);
    if($row['password'] == $_POST['password']) {
    } else {
        $error = "You're username/password combo was wrong try again.";
    }
}

?>