📄 logout.php
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<?php session_start(); // store to test if they *were* logged in $old_user = $_SESSION['valid_user']; unset($_SESSION['valid_user']); session_destroy();?><html><body><h1>Log out</h1><?php if (!empty($old_user)) { echo 'Logged out.<br />'; } else { // if they weren't logged in but came to this page somehow echo 'You were not logged in, and so have not been logged out.<br />'; }?> <a href="authmain.php">Back to main page</a></body></html>⌨️ 快捷键说明
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