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HomeBackend DevelopmentPHP Tutorialphp创建、获取cookie及基础要点分析_PHP

本文实例讲分析了php创建、获取cookie及基础要点。分享给大家供大家参考。具体如下:

假设为:cookie1.php文件

代码如下:

setCookie("name","百度",time()+60);
echo "保存cookie";
?>


必需参数为三个:

(1)第一参数:name为键值,自己设定;
(2)第二参数:实例中的”百度“表示键值name对应的value值;
(3)第三参数:表示过期时间,time()+60,表示过期时间为60秒;

实例中cookie代码解析,及基础要点

1、浏览器打开cookie1.php时,服务器会以信息:Set-Cookie:name=%B0%D9%B6%C8; expires=Tue, 06-Nov-2012 16:09:27 GMT(备注:该信息请用抓包工具查看)来回应http请求,客户端浏览器获得此信息,并保存到cookies文件里(不同浏览器与操作系统,保存位置与文件类型不一样)
2、如果没有设置第三个时间参数,默认是会话结束(关闭浏览器)时,cookie就失效(此情况,cookie是保存在浏览器缓存里)。
3、cookie只能保存字符串信息,也就是对象不能保存(session可以保存对象)。
4、如果键值是中文,默认采用 urlencode方式,将中文进行转码。
5、cookie保存时,以明文方式保存,所以,保存密码时需要进行处理,如md5。
6、可以保存多个cookie。
7、同一个页面中不同cookie,保存的时间可以设置成不一样。
8、一个网站对应有一个保存cookie的文件(如果有设置cookie的话)。

获取cookie

文件:cookie2.php

代码如下:

echo "

";<br>
print_r($_COOKIE);<br>
echo $_COOKIE['name'];<br>
?><br>
$_COOKIE是一个预定义变量(数组),在cookie的有效时间内,可以采用上面的代码输出cookie。<br>
知识要点说明:浏览器在访问cookie2.php页面的时候,会将cookies信息传送到服务器上,这是http协议规定的(可以采用抓包工具查看,如下图)
<p><img src="/static/imghwm/default1.png" data-src="http://files.bitsCN.com/file_images/article/201501/2015126110854372.jpg&" class="lazy" alt=""></p>
<p>希望本文所述对大家的php程序设计有所帮助。</p>
    
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