【PHP】html页面对php页面post错误求解决

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乱瞳_善
人气楷模
12

html 页面代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>相加</title>
</head>
<body>
<form action="add.php" method="post" >
a:<input type="text" name="a"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
PHP页面代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>相加</title>
</head>
<body>
<?php
if(isset($_POST['a'])) {
echo $_POST['a'];
}
?>
</body>
</html>