PHP简易计算器

代码：
这里写代码片
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>网页版计算器</title>
</head>

<body>



<?php
//判断输入框是否为空
if(!empty($_POST)){
$num1=$_POST['data1'];
$num2=$_POST['data2'];
$jjcc=$_POST['jieguo'];
$fuhao=$_POST['xllb'];
//输出运算过程
print_r($_POST);
//判断选择的是+ - * /
switch($fuhao){
    case '+':
    $jjcc=$num1+$num2;
    break;
    case '-':
    $jjcc=$num1-$num2;
    break;
    case '*':
    $jjcc=$num1*$num2;
    break;
    case '/':
    $jjcc=$num1/$num2;
    break;
    default: echo "你输入的不对，请重新输入！";
}
}else{
    $num1="";
    $num2="";
    $jjcc="";
    $fuhao="";
}


?>
<h1>网页版的计算器<h1>
<hr/>
<form id="form1" name="form1"action="" method="post">
<input name="data1" type="text" value='<?php echo $num1;?>'>
<select name="xllb">
<option value="+"<?php  if($fuhao=="+"){echo 'selected';}?>>+</option>
<option value="-"<?php  if($fuhao=="-"){echo 'selected="selected"';}?>>-</option>
<option value="*"<?php  if($fuhao=="*"){echo 'selected="selected"';}?>>*</option>
<option value="/"<?php  if($fuhao=="/"){echo 'selected="selected"';}?>>/</option></select>
<input name="data2" type="text" value="<?php echo $num2;?>">
<input type="submit" value="=" >
<input type="text" name="jieguo" value="<?php echo $jjcc;?>">
</form>
</body>
</html>
这里写图片描述
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