Can anyone help me figure out the meaning of this php error message? [closed]
$con = mysql_connect("localhost", "root", '');

if (!$con) {
    die('Cannot make a connection');
}


mysql_select_db('yumbox_table', $con) or die('Cannot make a connection');
isset($_POST['user_name'], $_POST['password'], $_POST['user_type']);

$data = mysql_query("SELECT *
                       FROM users
                      WHERE user_name == ($_POST['user_name'])
                        AND ($_POST['password'])
                        AND ($_POST['user_type'])") or die(mysql_error());

$info = mysql_fetch_array($data);
$count = mysql_numrows($data);

if ($count == 1) {
    echo("Success!!");
} else {
    echo("BIG FRIGGIN FAILURE!!");
}

mysql_close($con);

$data = mysql_query("SELECT * from users where user_name == ($_POST['user_name']) and ($_POST['password']) and ($_POST['user_type'])"

$user_name = mysql_real_escape_string($_POST['user_name']);
$password = mysql_real_escape_string($_POST['password']);
$user_type = mysql_real_escape_string($_POST['user_type']);
$data = mysql_query("SELECT * FROM users WHERE user_name == '$user_name' AND password == '$password' AND user_type == '$user_type'");

if(isset($_POST['user_name'], $_POST['password'], $_POST['user_type'])){
    $data = mysql_query("SELECT * from users
             where user_name = '".mysql_real_escape_string($_POST['user_name'])."' and
                   password  = '".mysql_real_escape_string($_POST['password'])."' and
                   user_type = '".mysql_real_escape_string($_POST['user_type'])."' ");

    if(mysql_numrows($data) == 1) {
       $info = mysql_fetch_array($data);
       echo("Success!!");
    } else {
       echo("BIG FRIGGIN FAILURE!!");
    }
}
else{
   echo "Required Data Missing";
}

mysql_close($con);

mysql_query("SELECT * from users where user_name == ($_POST['user_name']) and ($_POST['password']) and ($_POST['user_type'])")

//do escaping here. See note below.
$username = isset($_POST['user_name']) ? mysql_real_escape($_POST['user_name']) : '';
$pass     = isset($_POST['password']) ? mysql_real_escape($_POST['password']) : '';
$type     = isset($_POST['user_type']) ? mysql_real_escape($_POST['user_type']) : '';

mysql_query("SELECT * from users where user_name = '{$username}' AND password = '{$pass}' AND user_type = '{$type}'")