本文实例讲述了PHP会话控制。分享给大家供大家参考，具体如下：
关于cookie和session的测试代码：
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<?php
session_start();
define('u','a');
define('p','1');
if (isset($_GET['r']) && $_GET['r']== 1) {
unset($_COOKIE['username']);
unset($_COOKIE['password']);
unset($_SESSION['valid_login']);
}
if (isset($_POST['username']) && isset($_POST['password'])) {
$username = $_POST['username'];
$password = $_POST['password'];
if ($username == u && $password == p) {
$_SESSION['valid_login'] = 1;
setcookie('username', $username);
setcookie('password', $password);
} else {
echo 'incorrect u or p';
}
}
?>
<?php
if (isset($_SESSION['valid_login'])) {
printf('welcom, %s', $_COOKIE['username']);
} else {
?>
<form action="" method="post">
<input type="text" name="username" value="" />
<input type="password" name="password" value="" />
<input type="submit" />
</form>
<?php
}
?>
<br />
<a href="cookie_session.php" title="">refresh</a>
<br />
<a href="cookie_session.php?r=1" title="">clear</a>
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希望本文所述对大家PHP程序设计有所帮助。