谁能解释这种写法是什么意思:= @$user ?>
<form action="<?= $_SERVER['PHP_SELF'] ?>" method="post">
<p>Welcome to our website, you need to log in:</p>
<p>Username: <input type="text" name="user" value="<?= @$user ?>"><br />
Password: <input type="password" name="pass" value="<?= @$pass ?>"></p>
<p><input type="submit" value="Login" /></p>
</form>