利用cookie实现用户自动登录的代码-PHP源码

COOKIE 是由服务器发送到浏览器的变量。COOKIE 通常是服务器嵌入到用户计算机中的小文本文件。每当计算机通过浏览器请求一个页面，就会发送这个 COOKIE。

实例

echo( "COOKIE created? : " . setCOOKIE("COOKIE_name", "COOKIE_data" ) );

?>

如果要删除 COOKIE只要设置COOKIE的过期时间就行了，
实例

setCOOKIE ( "COOKIE_user", "test", time () + 60 * 60 * 24 * 30 );
setCOOKIE ( "COOKIE_pass", md5 ( "test" ), time () + 60 * 60 * 24 * 30 );

function logout() {
setCOOKIE ( "COOKIE_user", "", time () + 60 * 60 * 24 * 30 );
setCOOKIE ( "COOKIE_pass", "", time () + 60 * 60 * 24 * 30 );
}
logout ();
echo $_COOKIE ['COOKIE_user'] . "
";
echo "You have successfully logged out.";
?>

我们在开发中经常会用到COOKIE自动登录

实例

$GLOBALS['username'] = "test";
$GLOBALS['password'] = "test";

function validatelogin ($username, $password){
if (strcmp ($username, $GLOBALS['username']) == 0 && strcmp ($password, $GLOBALS['password']) == 0){
setCOOKIE ("COOKIE_user", $username, time()+60*60*24*30);
setCOOKIE ("COOKIE_pass", md5 ($password), time()+60*60*24*30);
return true;
} else {
return false;
}
}
if (validatelogin ("test","test")){
echo "Successfully logged in.";
} else {
echo "Sorry, invalid login.";
}
?>