php setcookie函数有什么用？
php setcookie函数
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。每当同一台计算机通过浏览器请求页面时，就会发送这个 cookie。
cookie 的名称自动指定为相同名称的变量。例如，如果被发送的 cookie 名为 "user"，则会自动创建一个名为 $user 的变量，包含 cookie 的值。
必须在任何其他输出发送到客户端前对 cookie 进行赋值。
如果成功，该函数返回 TRUE。如果失败则返回 FALSE。
语法
setcookie(name,value,expire,path,domain,secure)
提示和注释
提示：可以通过 $HTTP_COOKIE_VARS["user"] 或 $_COOKIE["user"] 来访问名为 "user" 的 cookie 的值。
注释：在发送 cookie 时，cookie 的值会自动进行 URL 编码。接收时会自动进行 URL 解码。如果您不需要这样，可以使用 setrawcookie() 代替。
示例1：通过把失效日期设置为过去的日期/时间，删除一个 cookie
<?php
// Set the expiration date to one hour ago
setcookie ("TestCookie", "", time() - 3600);
?>
<html>
<body>
...
...示例2：创建一个数组 cookie
<?php
setcookie("cookie[three]","cookiethree");
setcookie("cookie[two]","cookietwo");
setcookie("cookie[one]","cookieone");
// print cookies (after reloading page)
if (isset($_COOKIE["cookie"]))
{
foreach ($_COOKIE["cookie"] as $name => $value)
{
echo "$name : $value <br />";
}
}
?>
<html>
<body>
...
...输出：
three : cookiethree two : cookietwo one : cookieone
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