PHP+MYSQL+COOKIE(2)自动登陆

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<h1>登录页面</h1>
	<form action="doActive.php" method="POST">
		<table border="1" width="80%" bgcolor="#abcdef" cellpadding="0" cellspacing="0" >
			<tr>
				<td>用户名</td>
				<td><input type="text" name="username" id=""></td>
			</tr>
			<tr>
				<td>密码</td>
				<td><input type="password" name="password" id=""></td>
			</tr>
			<tr>
				<td colspan="2"><input type="checkbox" name="autologin" id="" value="1">一周内自动登录</td>
			</tr>
			<tr>
				<td colspan="2"><input type="submit" name="islogin" value="登录" ></td>
			</tr>
		</table>
	</form>
</body>
</html>