?php
/**
* Created by PhpStorm.
* User: admin
* Date: 2017/5/3
* Time: 0:55
*/
function add($x,$y){
return $x+$y;
}
function reduce($x,$y){
return $x-$y;
}
function times($x,$y){
return $x*$y;
}
function divide($x,$y){
return $x/$y;
}
$num1=$_GET['num1'];
$num2=$_GET['num2'];
$opt=isset($_GET['opt'])?$_GET['opt']:'add';
$a=$opt($num1,$num2);
?>
计算器