Home php教程 php手册 用PHP的超级变量$_GET获取HTML表单(Form) 数据

用PHP的超级变量$_GET获取HTML表单(Form) 数据

Jun 13, 2016 pm 12:09 PM
form get html php variable data yes use of Obtain form

$_GET 是 PHP 的超级变量之一。

当 HTML 表单 (HTML Form) 的 method 为 get 时 , $_GET 用来获取 HTML Form 的数据。

获取 HTML 表单 (HTML Form) 文本输入框 (input type="text") 数据
下面是一个 HTML 文件,这个 HTML 含有一个 HTML 表单 (HTML Form),主要用来让用户输入用户姓名的。

复制代码 代码如下:



Blablar.com HTML Form Method Get Example


Name:





该 HTML 的显示界面如下:

当你在这个 HTML 文件的表单文本框输入框里输入姓名,比如 "Jacky",然后鼠标点击ok 按钮,会跳转到 get.php,在 get.php 里会显示如下图。

get.php 的源代码如下:

复制代码 代码如下:



Blablar.com PHP $_GET Example

You are .



取表单控件的 name 值,可以获得该表单控件的数据。

比如 "username" 就是表单控件文本输入框的 name 值,

复制代码 代码如下:




用 $_GET["username"] 可以获得该文本输入框的数据。

复制代码 代码如下:


echo $_GET["username"]
?>


获取 HTML 表单 (HTML Form) 单选框 (input type="radio") 数据
取表单单选框的 name 值,可以获得表单单选框的值。

下面是一个含有表单单选框的 HTML 文件,代码如下:

复制代码 代码如下:



Blablar.com


Apple

Orange

Mango






图示如下:

在该HTML 文件里,随便选择一项,比如选择 "Orange",然后点击按钮 ok,浏览器会跳转到 radio.php,在 radio.php 里的显示结果是 "Orange"。radio.php 的源代码如下:

复制代码 代码如下:



Blablar.com





$_GET["fruit"]中的fruit 是表单单选框的 name 值。

获取 HTML 表单 (HTML Form) 复选框 (input type="checkbox") 数据
用户可以通过 HTML Form 复选框选择多个值,所以 $_GET 得到的不止一个值,是个数组。

在写 HTML Form 复选框的 name 值时注意,name 值最后要加上[ ]。

如下示例,name="fruit[ ]":

复制代码 代码如下:



Blablar.com


Apple

Orange

Mango






该HTML 文件显示结果如图:

如果你选择Orange和Mango,并点击OK按钮,浏览器会跳转到 checkbox.php,并显示如图结果。

checkbox.php 的源代码如下:

复制代码 代码如下:



Blablar.com

echo count($_GET["fruit"]),"
";
foreach ($_GET["fruit"] as $value)
{echo $value,"
";
}
?>



用 count 函数得到数组$_GET["fruit"]的元素个数,如果用户选了2项,得到的结果就是2。然后用 foreach 循环输出$_GET["fruit"]每个元素的值,也就是用户所选项目的值,Orange和Mango。

下一章节我们讲述用 PHP 超级变量 $_POST 获取 HTML 表单 (HTML Form) 的数据。
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