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PHP setcookie()函数有什么用

Jun 06, 2016 pm 08:27 PM
php setcookie

PHP setcookie()函数有什么用

PHP setcookie()函数有什么用?

定义和用法

setcookie()函数向客户端发送一个HTTP cookie。

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。

cookie 的名称指定为相同名称的变量。例如,如果被发送的 cookie 名为 "name",会自动创建名为 $user 的变量,包含 cookie 的值。

必须在任何其他输出发送前对 cookie 进行赋值。

如果成功,则该函数返回 true,否则返回 false。

语法

setcookie(name,value,expire,path,domain,secure)
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参数

name 必需。规定 cookie 的名称。

value 必需。规定 cookie 的值。

expire 可选。规定 cookie 的有效期。

path 可选。规定 cookie 的服务器路径。

domain 可选。规定 cookie 的域名。

secure 可选。规定是否通过安全的 HTTPS 连接来传输 cookie。

提示和注释

注释:可以通过 $HTTP_COOKIE_VARS["user"] 或 $_COOKIE["user"] 来访问名为 "user" 的 cookie 的值。

注释:在发送 cookie 时,cookie 的值会自动进行 URL 编码。接收时会进行 URL 解码。如果你不需要这样,可以使用 setrawcookie() 代替。

例子

例子 1

设置并发送 cookie:

<?php
$value = "my cookie value";
// 发送一个简单的 cookie
setcookie("TestCookie",$value);
?>
<html>
<body>
...
...
<?php
$value = "my cookie value";
// 发送一个 24 小时候过期的 cookie
setcookie("TestCookie",$value, time()+3600*24);
?>
<html>
<body>
...
...
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例子 2

检索 cookie 值的不同方法:

<html>
<body>
<?php
// 输出个别的 cookie
echo $_COOKIE["TestCookie"];
echo "<br />";
echo $HTTP_COOKIE_VARS["TestCookie"];
echo "<br />";
// 输出所有 cookie
print_r($_COOKIE);
?>
</body>
</html>
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输出:

my cookie value
my cookie value
Array ([TestCookie] => my cookie value)
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例子 3

通过把失效日期设置为过去的日期/时间,删除一个 cookie:

<?php
// 把失效日期设置为一小时前
setcookie ("TestCookie", "", time() - 3600);
?>
<html>
<body>
...
...
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例子 4

创建一个数组 cookie:

<?php
setcookie("cookie[three]","cookiethree");
setcookie("cookie[two]","cookietwo");
setcookie("cookie[one]","cookieone");
// 输出 cookie (在重载页面后)
if (isset($_COOKIE["cookie"]))
  {
  foreach ($_COOKIE["cookie"] as $name => $value)
    {
    echo "$name : $value <br />";
    }
  }
?>
<html>
<body>
...
...
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输出:

three : cookiethree
two : cookietwo
one : cookieone
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