PHP dataClass::checkLogin示例

<?php

require_once 'connection.php';
$data = new dataClass();
if (isset($_POST['action']) && !empty($_POST['action'])) {
    $action = $_POST['action'];
    switch ($action) {
        case 'checkLogin':
            $data->checkLogin();
            break;
    }
}
//startPHP
//////////////////
class dataClass
{
    function checkLogin()
    {
        // username and password sent from form
        $myusername = $_POST['myusername'];
        $mypassword = $_POST['mypassword'];
        // To protect MySQL injection (more detail about MySQL injection)
        $myusername = stripslashes($myusername);
        $myusername = mysql_real_escape_string($myusername);
        $sql = "SELECT * FROM user WHERE username='******'";
        $result = mysql_query($sql);
        $currentUser = mysql_fetch_array($result);
        $salt = $currentUser['salt'];
        $mypassword = stripslashes($mypassword);
        $mypassword = mysql_real_escape_string($mypassword);
        //$saltedMD5Pass = md5($mypassword . $salt);