📄 authmain.php
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<?phpsession_start();if (isset($_POST['userid']) && isset($_POST['password'])){ // if the user has just tried to log in $userid = $_POST['userid']; $password = $_POST['password']; $db_conn = new mysqli('localhost', 'webauth', 'webauth', 'auth'); if (mysqli_connect_errno()) { echo 'Connection to database failed:'.mysqli_connect_error(); exit(); } $query = 'select * from authorised_users ' ."where name='$userid' " ." and password=sha1('$password')"; $result = $db_conn->query($query); if ($result->num_rows >0 ) { // if they are in the database register the user id $_SESSION['valid_user'] = $userid; } $db_conn->close();}?><html><body><h1>Home page</h1><? if (isset($_SESSION['valid_user'])) { echo 'You are logged in as: '.$_SESSION['valid_user'].' <br />'; echo '<a href="logout.php">Log out</a><br />'; } else { if (isset($userid)) { // if they've tried and failed to log in echo 'Could not log you in.<br />'; } else { // they have not tried to log in yet or have logged out echo 'You are not logged in.<br />'; } // provide form to log in echo '<form method="post" action="authmain.php">'; echo '<table>'; echo '<tr><td>Userid:</td>'; echo '<td><input type="text" name="userid"></td></tr>'; echo '<tr><td>Password:</td>'; echo '<td><input type="password" name="password"></td></tr>'; echo '<tr><td colspan="2" align="center">'; echo '<input type="submit" value="Log in"></td></tr>'; echo '</table></form>'; }?><br /><a href="members_only.php">Members section</a></body></html>⌨️ 快捷键说明
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