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HomeBackend DevelopmentPHP TutorialPHP5中Cookie小结(一)

PHP5中Cookie总结(一)

一. cookie的配置与应用


设置cookie

bool setcookie ( string name [, string value [, int expire [, string path [, string domain [, bool secure]]]]] );

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删除cookie

bool setcookie(name, "");

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参数说明举例
name Cookie 的名字。 使用 $_COOKIE['cookiename'] 调用名为 cookiename 的 cookie。
value Cookie 的值。此值保存在客户端,不要用来保存敏感数据。 假定 name 是 'cookiename',可以通过 $_COOKIE['cookiename'] 取得其值。
expire Cookie 过期的时间。这是个 Unix 时间戳,即从 Unix 纪元开始的秒数。换而言之,通常用 time() 函数再加上秒数来设定 cookie 的失效期。或者用 mktime()来实现。 time()+60*60*24*30 将设定 cookie 30 天后失效。如果未设定,cookie 将会在会话结束后(一般是浏览器关闭)失效。
path Cookie 在服务器端的有效路径。 如果该参数设为 '/' 的话,cookie 就在整个 domain 内有效,如果设为 '/foo/',cookie 就只在 domain 下的 /foo/ 目录及其子目录内有效,例如 /foo/bar/。默认值为设定 cookie 的当前目录。
domain 该 cookie 有效的域名。 要使 cookie 能在如 example.com 域名下的所有子域都有效的话,该参数应该设为 '.example.com'。虽然 . 并不必须的,但加上它会兼容更多的浏览器。如果该参数设为 www.example.com 的话,就只在 www 子域内有效。细节见 Cookie 规范中的 tail matching。
secure 指明 cookie 是否仅通过安全的 HTTPS 连接传送。当设成 TRUE 时,cookie 仅在安全的连接中被设置。默认值为 FALSE 01

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和其它标头一样,cookie 必须在脚本的任何其它输出之前发送(这是协议限制)。这需要将本函数的调用放到任何输出之前,包括 标签以及任何空格。如果在调用 setcookie() 之前有任何输出,本函数将失败并返回 FALSE。如果 setcookie() 函数成功运行,将返回 TRUE。这并不说明用户是否接受了 cookie。

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