php mysql 登录注销_用户退出注销操作
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/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/2/27 0027
* Time: 上午 10:47
*/
header('Content-type:text/html;charset=utf-8');
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
if (empty($_POST['username'])){
echo "";
}else {
$username=$_POST['username'];
}
if (empty($_POST['password'])){
echo "";
}else{
$password=$_POST['password'];
}
}
$mysqli = new mysqli('localhost', 'root', 'root', 'student');
$result = $mysqli->query("SELECT password FROM user WHERE username = "."'$username'");
$rs=$result->fetch_row();
if (!empty($rs)){
if ($password != $rs[0]) {
echo "";
}else{
$expire=3600;
ini_set('session.gc_maxlifetime', $expire);//保存1小时
if (empty($_COOKIE['PHPSESSID'])) {
session_set_cookie_params($expire);
session_start();
}else{
session_start();
setcookie('PHPSESSID', session_id(), time() + $expire);
}
if(isset($_SESSION['username'])){
exit("您已经登入了，请不要重新登入！用户名：{$_SESSION['username']}---注销");
}else{
$_SESSION['username']=$_POST['username'];
}
echo "
";
echo "您好！{$_SESSION['username']},欢迎回来！";
echo "注销";
}
}else{
echo "";
}
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