110 lines
2.6 KiB
Markdown
110 lines
2.6 KiB
Markdown
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---
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title: PHP Cookies
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localeTitle: PHP Cookies
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---
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# PHP COOKIES
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## 什么是Cookie？
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Cookie通常用于标识用户。它是服务器嵌入用户计算机的小文件。 每次同一台计算机通过浏览器请求页面时，它也会发送cookie。
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Cookie旨在成为记住有状态信息或记录用户浏览活动的可靠机制。
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它们还可用于记住用户先前在表单字段（如姓名，地址，密码等）中输入的任意信息。
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## 使用PHP创建Cookie
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使用PHP，您可以创建和检索cookie值。 使用setcookie（）函数创建cookie。
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`setcookie(name, value, expire, path, domain, secure, httponly);`
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只有_name_参数是必需参数。所有其他参数都是可选的。
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## PHP创建/检索Cookie
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以下示例创建名为“user”的cookie，其值为“John Doe”。
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Cookie将在30天后（86400 \* 30）过期。
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“/”表示cookie在整个网站中可用（否则，您可以选择您喜欢的目录）。
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然后我们检索cookie“user”的值（使用全局变量$ \_COOKIE）。
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我们还使用isset（）函数来确定cookie是否已设置：
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**例：**
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```
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<?php
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$cookie_name = "user";
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$cookie_value = "John Doe";
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setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); // 86400 = 1 day
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?>
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<html>
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<body>
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<?php
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if(!isset($_COOKIE[$cookie_name])) {
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echo "Cookie named '" . $cookie_name . "' is not set!";
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} else {
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echo "Cookie '" . $cookie_name . "' is set!<br>";
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echo "Value is: " . $_COOKIE[$cookie_name];
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}
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?>
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</body>
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</html>
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```
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**注意：** setcookie（）函数必须出现**在。之前** 标签。
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输出：
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Cookie'用户'已设置！
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价值是：John Doe
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## PHP修改Cookie值
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要修改cookie，只需使用setcookie（）函数再次设置该值：
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**例：**
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```
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<?php
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$cookie_name = "user";
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$cookie_value = "Jane Porter";
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setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/");
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?>
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<html>
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<body>
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<?php
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if(!isset($_COOKIE[$cookie_name])) {
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echo "Cookie named '" . $cookie_name . "' is not set!";
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} else {
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echo "Cookie '" . $cookie_name . "' is set!<br>";
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echo "Value is: " . $_COOKIE[$cookie_name];
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}
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?>
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</body>
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</html>
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```
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输出：
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Cookie'用户'已设置！
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价值观是：Alex Porter
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## PHP删除Cookie
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要删除cookie，请使用过去有过期日期的setcookie（）函数：
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**例：**
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```
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<?php
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// set the expiration date to one hour ago
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setcookie("user", "", time() - 3600);
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?>
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<html>
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<body>
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<?php
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echo "Cookie 'user' is deleted.";
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?>
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</body>
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</html>
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```
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输出：
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Cookie'用户'已删除。
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