获取表单数据是表单应用中最基本的操作，表单数据的传递方法有两种，即POST()方法和GET()方法，下面说说PHP中这两种方法的优缺点和案例！
一、使用POST()方法提交表单
应用POST()方法时，只需将<form>表单中的属性method设置成POST即可，POST()方法不依赖URL，不会显示在地址栏。POST()方法可以没有限制地传递数据到服务器， 所有提交的信息在后台传输，用户在浏览器端看不到这一过程的，安全性高。所以POST()方法比较适合用于发送一个保密的（如信用卡号）或者容量较大的数据到服务器。
实例：使用POST()方法发送文本框信息到服务器！
在上面的代码中，form表单的method属性指定了POST()方法的传递方式，并通过action属性指定了数据处理页为txt.php。因此，当点击“提交”按钮后，即提交文本框的信息到服务器，运行结果如下
二、使用GET()方法提交表单
GET()方法是<form>表单中method属性的默认方法，使用GET()方法提交的表单数据被附加到URL后， 并作为URL的一部分发送到服务器端。在程序的开发过程中，由于GET()方法提交的表单数据是附加到URL上发送的，因此，在URL的地址栏中将会显示“URL+用户传递的参数”。
GET()方法的传参格式如下：
其中，url为表单响应地址（如 ），name1为表单元素的名称，value1为表单元素的值，url和表单元素之间用“？”隔开，而多个表单元素之间用“&”隔开，每个表单元素的格式都是name=value，固定不变。
实例：创建一个表单来实现应用GET()方法提交用户名和密码，并显示在URL地址栏中，添加一个文本框，命名为user 添加一个密码域，命名为pwd;将表单的method属性设置为GET()方法！如下：
运行本实例，在文本框中输入用户名和密码，单击“提交”按钮，文本框内的信息就会显示在URL地址栏中，如下：
可以看出，这种方法会将参数暴露。如果用户传递的参数是非保密性的参数，那么采用GET()方法传递数据是可行的，如果用户传递的是保密性的参数（如密码），这种方法就会不安全。
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