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表单的作用是采集客户端提交的数据,并把数据提交给服务端。
比如在登录一个网站时,你需要输入自己的用户名和密码才能登陆。
表单的两个标签必须是成对出现的:<form></form>。
form标签有两个必填的属性 : action,method。
action的作用是指定要提交到服务器的地址,比如我要提交到本站的info.php文件,那么就写成<form action=”info.php“>
method属性,顾名思义就是提交数据的方法,它有两个值可选:post/get ,post是隐藏传递,get是地址栏传递。
如果用get传递,以上就可以写成:<form action=”info.php“ method=”get”>
也可以多行文本textarea等:
<textarea name=”content”></textarea>
最后加一个提交按钮和一个重置按钮:
<input type=”submit” value=”提交”/>
<input type=”reset” value=”重置”/>
以上的几个标签除了提交、重置和form表单外,我都有些name属性,因为服务端是通过标签的name属性来获取它的值的。
PHP有四个不同的数组变量用来处理用户的输入。
HTTP_GET_VARS数组用来处理GET方式提交的变量,
HTTP_POST_VARS数组用于处理POST方式提交的变量,
HTTP_ cookie _VARS数组用于处理作为cookie头提交的变量,
而对于HTTP_POST_FILES数组(比较新的PHP才提供),则完全是用户用来提交变量的一种可选方式。
有三种方式:$_GET,$_POST,$_REQUEST。
$_GET只能获取get方法提交的数据,$_POST方法只能获取post方法提交的数据,而$_REQUEST能同时获取get和post方法提交的数据。
比如要得到用户输入的用户名和密码的值,就是 $_GET[“username”] 和$_GET[“password”],或者$_REQUEST[“username”] 和$_REQUEST[“password”]。
以上是简单的表单数据的接收。
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