post

<?php 
//通过$_GET变量获得表单以get方式提交的数据！
$n1 = $_POST['num1'];
$n2 = $_POST["num2"];
$result = $n1 + $n2;
//也可以直接啦：
$result2 = $_POST['num1'] + $_POST['num2'];
echo "<br>相加计算的结果为：", $result;
echo "<br>相加计算的结果为：", $result2;
 ?>

get

<?php 
//通过$_GET变量获得表单以get方式提交的数据！
$name = $_GET['userName'];
$age = $_GET["age"];

echo "<br>姓名为：", $name;
echo "<br>年龄为：", $age;
 ?>

request

<?php 
$n1 = "";
$n2 = "";
$result = "";
if( isset($_REQUEST['num1']) ) 
{
	$n1 = $_REQUEST['num1'];
	$n2 = $_REQUEST['num2'];
	$result = $n1 + $n2;
	//echo "<br>计算结果为：" , $result;
	
	echo "<br>用户名：", $_REQUEST['userName'];
	echo "<br>你的账户余额为：0,请交费。。。";
}
 ?>