利用cookie实现用户自动登录的代码
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,实例代码如下:
<?php
echo ( "Cookie created? : " . setcookie( "cookie_name" , "cookie_data" ) );
?>
<html>
<head>
<title>Cookie</title>
</head>
<body>
</body>
</html>如果要删除 cookie只要设置cookie的过期时间就行了,实例代码如下:
<?php
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' ] . "<br />" ;
echo "You have successfully logged out." ;
?>我们在开发中经常会用到cookie自动登录,实例代码如下:
<?php
$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." ;
}
?>
