通过全局变量来判定是否设置session相关值
<?php
session_start();if (! isset($_SESSION['username'])) {if (isset($_POST['username'])) {$name = $_POST['username'];if ($name == '123') {$_SESSION['username'] = $_POST['username'];echo "Welcome!<br/>";} else {require_once 'login.html';}} else {require_once 'login.html';}
} else {echo "you have logged!<br/>";session_unset();
}
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