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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>计算器</title>
</head>
<body>
<form method="post">
<table align="center">
<tr>
<td align="center">第一个数</td><td><input type="text" name="first"></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="radio" name="operator" value="+">+
<input type="radio" name="operator" value="-">-
<input type="radio" name="operator" value="*">*
<input type="radio" name="operator" value="/">/
</td>
</tr>
<tr>
<td align="center">第二个数</td><td><input type="text" name="second"></td>
</tr>
<tr>
<td> <input type="submit" value="提交"></td>
</tr>
</table>
</form>
<?php
header("content-type:text/html;charset=utf-8");
$first=$_POST['first'];
$second=$_POST['second'];
$operator=$_POST['operator'];
echo '结果为:';
if ( $operator == '+' )
{
echo $first+$second;
}
if($operator == '-')
{
echo $first-$second;
}
if($operator == '*')
{
echo $first*$second;
}if($operator == '/')
{
echo $first/$second;
}
?>
</body>
</html>
这个会报警告： 上网查了一下，因为接收了空值，所以报的这个警告。 所以这个东西可以不用管。 解决方法： https://www.baidu.com/link?url=gy5XGLhoRy8bUMPZLMcTGuWl7nQKAXt9Zrn642HRBhAcZS5oRax1KFrga5IqAxzXlKs5Xv3qGnc68AjakEKIW_&wd=&eqid=bb0491f00000160a000000025ae170a7 运行结果：
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2022-07-18
2022-08-16
2022-11-06
2022-07-29
2022-08-18
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